# Quiz 17: Temperature and the Kinetic Theory of Gases

Physics & Astronomy

Q 1Q 1

Which of the following statements about thermal contact and thermal equilibrium is NOT true?
A) Two objects can be in thermal equilibrium even if they are not in thermal contact with each other.
B) Heat may be transferred between two objects when they are in thermal contact.
C) For energy to be transferred between two objects they have to be in thermal contact.
D) Thermal contact between two objects allows energy to be transferred without the use of macroscopic work.
E) Two objects, one that feels cold and the other does not feel as cold, does not imply that they are not in thermal equilibrium.

Free

Multiple Choice

C

Q 2Q 2

If it is known that two bodies are in thermal equilibrium, one can conclude that
A) they must be in thermal equilibrium with a third body.
B) there must be a net heat flow between them.
C) the bodies must be at different temperatures.
D) some shared physical property must be changing.
E) None of these is correct.

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Multiple Choice

E

Q 3Q 3

If it is known that two bodies are in thermal equilibrium, one can conclude that
A) they must be in thermal equilibrium with a third body.
B) there must be a net heat flow between them.
C) the bodies must be at different temperatures.
D) some shared physical property must be changing.
E) they must be at the same temperature.

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Multiple Choice

E

Q 4Q 4

An example of a thermometric property is
A) the volume of a gas.
B) the pressure of a confined gas.
C) the electrical resistance of an electrical conductor.
D) the length of a column of mercury.
E) All of these are correct.

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Multiple Choice

Q 5Q 5

Calculate the point on the Fahrenheit scale when numerically it is 100 degrees larger than that of the Celsius scale for the same temperature.
A) 85
B) 265
C) 185
D) 165
E) no such point exists

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Multiple Choice

Q 6Q 6

The temperature in January in Winnipeg, Manitoba, has been known to go down to -40ºC. What is this temperature on the Fahrenheit scale?
A) -40ºF
B) -104ºF
C) +9.8ºF
D) -72ºF
E) -32ºF

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Multiple Choice

Q 7Q 7

Normal human body temperature is 98.6ºF. What is the corresponding Celsius temperature?
A) 54.8ºC
B) 72.6ºC
C) 40.0ºC
D) 37.0ºC
E) 35.5ºC

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Multiple Choice

Q 8Q 8

If you plot a graph with Fahrenheit temperatures along the horizontal axis and the corresponding Celsius temperatures along the vertical axis, the slope of the equal-temperature line will be
A) -40 Fº/Cº
B) 32 Fº/Cº
C) 1.8 Fº/Cº
D) 0.56 Fº/Cº
E) 0 Fº/Cº

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Multiple Choice

Q 9Q 9

A temperature difference of 5 Cº is the same as a difference of
A) 41 Fº
B) 14 Fº
C) 9 Fº
D) 5 Fº
E) -15 Fº

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Multiple Choice

Q 10Q 10

Which curve correctly represents the relation of the temperature in degrees Fahrenheit to the temperature in degrees Celsius?
A) 1
B) 2
C) 3
D) 4
E) 5

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Multiple Choice

Q 11Q 11

A thermometer is constructed by filling a small glass tube with a liquid that expands linearly with temperature. The thermometer is then calibrated at 0C and 100C, and the scale evenly divided between the two values. Unfortunately a manufacturing defect results in the middle one-third of the tube being narrower, otherwise the tube has uniform diameter. For what range of temperatures is the reading accurate?
A) 0C to 33C
B) 0C and 67C
C) 0C to 33C and 67C to 100C
D) 67C to 100C
E) At no point does this thermometer gives the right reading except at 0C and 100C.

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Multiple Choice

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Multiple Choice

Q 13Q 13

A temperature difference of 9ºF is the same as a difference of
A) 5ºC
B) 9ºC
C) 20ºC
D) 68ºC
E) 100ºC

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Multiple Choice

Q 14Q 14

The temperature at which the Celsius and Fahrenheit scales read the same is
A) 40ºC
B) -40ºC
C) 20ºF
D) 68ºF
E) 100ºC

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Multiple Choice

Q 15Q 15

The highest and lowest temperatures ever recorded in the United States are 134ºF (California, 1913) and -80ºF (Alaska, 1971). What are these temperatures in kelvins?
A) 407 K and 193 K
B) 330 K and 211 K
C) 347 K and 228 K
D) 340 K and 300 K
E) 365 K and 246 K

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Multiple Choice

Q 16Q 16

A constant-volume gas thermometer reads 6.66 kPa at the triple point of water. What is the pressure reading at the normal boiling point of water?
A) 2.44 kPa
B) 18.2 kPa
C) 9.10 kPa
D) 11.8 kPa
E) 4.87 kPa

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Multiple Choice

Q 17Q 17

Which of the following statements about absolute zero temperature is true?
A) At absolute zero all translational motion of the particles ceases.
B) At absolute zero all rotational motion of the particles ceases.
C) Absolute zero is defined at 273.15C.
D) At absolute zero all the particles are at rest, except for the quantum motion.
E) All the above.

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Multiple Choice

Q 18Q 18

An interval of 30 kelvins is equivalent to an interval of
A) 30 Fahrenheit degrees.
B) 76 Fahrenheit degrees.
C) 577 Fahrenheit degrees.
D) 303 Fahrenheit degrees.
E) None of these is correct.

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Multiple Choice

Q 19Q 19

The temperature of the air on a hot day when the temperature is 108ºF is
A) 10ºC
B) 110ºC
C) 32 K
D) 315 K
E) 420 K

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Multiple Choice

Q 20Q 20

The graph shows the natural logarithm of the temperature of various thermometers as a function of time. The thermometer that cools at the quickest rate is
A) 1
B) 2
C) 3
D) 4
E) 5

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Multiple Choice

Q 21Q 21

The graph shows the natural logarithm of the temperature of various thermometers as a function of time. The thermometer that cools at the slowest rate is
A) 1
B) 2
C) 3
D) 4
E) 5

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Multiple Choice

Q 22Q 22

A gas thermometer could measure temperature change by measuring the change in
A) density at constant volume.
B) specific heat at constant volume.
C) pressure at constant volume.
D) volume at constant temperature.
E) mass at constant volume.

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Multiple Choice

Q 23Q 23

The temperature of the air on a cold day when the temperature is 23ºF is
A) 100 K
B) -5ºC
C) 273 K
D) 373 K
E) -15ºF

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Multiple Choice

Q 24Q 24

A large balloon is being filled with He from gas cylinders. The temperature is 25C and the pressure is 1 atmosphere. The volume of the inflated balloon is 2500 m

^{3}. What was the volume of He in the cylinders if the gas was under a pressure of 110 atmospheres and at a temperature of 12C when in the gas cylinders? A) 11 m^{3 }B) 22 m^{3 }C) 24 m^{3 }D) 15 m^{3 }E) 23 m^{3 }Free

Multiple Choice

Q 25Q 25

What mass of He gas occupies 8.5 liters at 0C and 1 atmosphere? (The molar mass of He = 4.00 g/mol.)
A) 10.5 g
B) 0.66 g
C) 2.6 g
D) 0.38 g
E) 1.52 g

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Multiple Choice

Q 26Q 26

A mass of He gas occupies a volume V at standard temperature and pressure. What volume is occupied if the mass is halved, the absolute temperature doubled, and the pressure increased by a third?
A) (3/16)V
B) (4/3)V
C) (3/4)V
D) (3/8)V
E) (1/3)V

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Multiple Choice

Q 27Q 27

A gas has a density X at standard temperature and pressure. What is the new density when the absolute temperature is doubled and the pressure increased by a factor of 3?
A) (2/3)X
B) (4/3)X
C) (3/4)X
D) (6)X
E) (3/2)X

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Multiple Choice

Q 28Q 28

Inside a sphere of radius 12 cm are 8.0 10

^{23}gas molecules at a temperature of 50C. What pressure do the gas molecules exert on the inside of the sphere? A) 650 10^{3}Pa B) 370 10^{3}Pa C) 76.0 10^{3}Pa D) 160 10^{3}Pa E) 490 10^{3}PaFree

Multiple Choice

Q 29Q 29

You can double both the pressure and the volume of an ideal gas if you change the temperature of the gas by
A) reducing it to one-quarter of its original value.
B) doubling it.
C) reducing it to one-half of its original value.
D) quadrupling it.
E) doing none of these

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Multiple Choice

Q 30Q 30

The air in a balloon occupies a volume of 0.10 m

^{3}when at a temperature of 27ºC and a pressure of 1.2 atm. What is the balloon's volume at 7ºC and 1.0 atm? (The amount of gas remains constant.) A) 0.022 m^{3 }B) 0.078 m^{3 }C) 0.089 m^{3 }D) 0.11 m^{3 }E) 0.13 m^{3 }Free

Multiple Choice

Q 31Q 31

In a vacuum system, a container is pumped down to a pressure of 1.33 10

^{-6}Pa at 20ºC. How many molecules of gas are there in 1 cm^{3}of this container? (Boltzmann's constant k = 1.38 10^{-23}J/K) A) 3.3 10^{8 }B) 4.8 10^{9 }C) 3.3 10^{14 }D) 7.9 10^{12 }E) 4.8 10^{12 }Free

Multiple Choice

Q 32Q 32

A rigid container of air is at atmospheric pressure and 27ºC. To double the pressure in the container, heat it to
A) 54ºC
B) 300ºC
C) 327ºC
D) 600ºC
E) 327 K

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Multiple Choice

Q 33Q 33

If a mass of oxygen gas occupies a volume of 8 L at standard temperature and pressure, what is the change in the volume if the temperature is decreased to 136 K and the pressure remains constant?
A) It increases to 16 L.
B) It decreases to 12 L.
C) It increases to 24 L.
D) It decreases to 4 L.
E) It increases to 12 L.

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Multiple Choice

Q 34Q 34

If a mass of oxygen gas occupies a volume of 8 L at standard temperature and pressure, what is the change in the volume if the temperature is reduced by one half and the pressure is doubled?
A) It increases to 12 L.
B) It decreases to 6 L.
C) It increases to 24 L.
D) It decreases to 2 L.
E) It does not change.

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Multiple Choice

Q 35Q 35

A collection of oxygen molecules occupies a volume V at standard temperature and pressure. What is the new volume if the amount of oxygen is doubled and the pressure is tripled?
A) V
B) (2/3)V
C) (3/2)V
D) 6V
E) (5/9)V

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Multiple Choice

Q 36Q 36

If the pressure and volume of an ideal gas are both reduced to half their original value, the absolute temperature of the gas is
A) unchanged.
B) doubled.
C) halved.
D) increased by a factor of 4.
E) decreased by a factor of 4.

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Multiple Choice

Q 37Q 37

If both the temperature and the volume of an ideal gas are doubled, the pressure is
A) increased by a factor of 4.
B) doubled also.
C) unchanged.
D) diminished by a factor of ¼.
E) None of these is correct.

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Multiple Choice

Q 38Q 38

Assume that helium is a perfect gas and that the volume of a cylinder containing helium is independent of temperature. A cylinder of helium at +85ºC has a pressure of 208 atm. The pressure of the helium when it is cooled to -55ºC is
A) -132 atm
B) 127 atm
C) 335 atm
D) 132 atm
E) 204 atm

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Multiple Choice

Q 39Q 39

The relationship between the pressure and the volume of a gas expressed by Boyle's law holds true
A) for some gases under any conditions.
B) if the density is constant.
C) if the container of the gas can expand with increasing pressure.
D) if the temperature is constant.
E) for all gases under any conditions.

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Multiple Choice

Q 40Q 40

Which of the following statements about the ideal gas law, PV = nRT, is NOT true?
A) When the temperature of two low density gases, which are initially at the same temperature, pressure and volume, is increased by the same amount, the volume increases by the same amount.
B) When the volume of two low density gases, which are initially at the same temperature, pressure and volume, is compressed by the same amount, the temperature increases by the same amount.
C) A P-T plot of any gas at low density intercept the T-axis at the same point.
D) The intercept at the ordinate for PV/nT vs P plot of any gas is the gas constant.
E) The ideal gas law is valid for high density of all gases.

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Multiple Choice

Q 41Q 41

Boltzmann's constant, k, has a value of 1.381 10

^{-23}J/K. What is the significance of the constant? A) It defines a characteristic energy at the microscopic level given the temperature in kelvins. B) It allows the pressure of the gas to be calculated given the volume and temperature. C) It measures the average kinetic energy of a molecule at a given temperature for each degree of freedom. D) (A) and (B) E) (A) and (C)Free

Multiple Choice

Q 42Q 42

The air around us has 78% nitrogen and 21% oxygen. If the pressure is 1 atm, the pressure due to oxygen is
A) 0.21 atm
B) 0.78 atm
C) 1 atm
D) 0.5 atm
E) 0.67 atm

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Multiple Choice

Q 43Q 43

A cylinder of volume 50 L contains oxygen gas at a pressure of 2 atm. If nitrogen gas of volume 25 L and at pressure 1 atm is added to the oxygen cylinder, the new pressure is
A) 2 atm
B) 3 atm
C) 2.5 atm
D) 3.5 atm
E) 4 atm

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Multiple Choice

Q 44Q 44

A room measures 3 m 4 m 2 m and is at 15C and 1 atm. When the temperature is increased to 25C, the number of molecules that escaped from the room is, assuming that the pressure stays at 1 atm
A) 6.1 10

^{2}^{6}B) 2.1 10^{25}C) 2.9 10^{2}^{6}D) 1.2 10^{2}^{8}E) 7.04 10^{2}^{7}Free

Multiple Choice

Q 45Q 45

A cylinder contains oxygen gas at a temperature of 7ºC and a pressure of 15 atm in a volume of 100 L. A fitted piston is lowered into the cylinder, decreasing the volume occupied by the gas to 80 L and raising the temperature to 40ºC. The gas pressure is now approximately
A) 3040 atm
B) 595 atm
C) 108 atm
D) 21 atm
E) 17 atm

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Multiple Choice

Q 46Q 46

A mass of air is at pressure P and volume V at 1ºC. When it is made to occupy half this volume at three times this pressure, its temperature becomes approximately
A) 411ºC
B) 0.67ºC
C) 1.5ºC
D) 6ºC
E) 411 K

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Multiple Choice

Q 47Q 47

An ideal gas whose original temperature and volume are 27ºC and 0.283 m

^{3}undergoes an isobaric expansion. If the final temperature is 87ºC, then the final volume is approximately A) 0.0340 m^{3 }B) 0.0552 m^{3 }C) 0.170 m^{3 }D) 0.340 m^{3 }E) 1.45 m^{3 }Free

Multiple Choice

Q 48Q 48

One mole of hydrogen gas (molar mass = 2.0 g/mol) has an rms velocity of 2.0 10

^{3}m/s. To what temperature on the Celsius scale does this correspond? A) 4.8 10^{4 }B) 3.2 10^{2 }C) 3.2 10^{5 }D) 48 E) 69Free

Multiple Choice

Q 49Q 49

At what common Celsius temperature is the rms velocity of oxygen molecules (molar mass = 32 g/mol) double that of hydrogen molecules (molar mass = 2.0 g/mol)?
A) 50
B) zero
C) no such temperature exists
D) 2.0
E) 16

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Multiple Choice

Q 50Q 50

Two monoatomic gases, helium and neon, are mixed in the ratio of 2 to 1 and are in thermal equilibrium at temperature T (the molar mass of neon = 5 the molar mass of helium). If the average kinetic energy of each helium atom is U, calculate the average energy of each neon atom.
A) U
B) 0.5U
C) 2U
D) 5U
E) U/5

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Multiple Choice

Q 51Q 51

Two monoatomic gases, helium and neon, are mixed in the ratio of 2 to 1 and are in thermal equilibrium at temperature T (the molar mass of helium = 4.0 g/mol and the molar mass of neon = 20.2 g/mol). If the average kinetic energy of each helium atom is 6.3 10

^{}^{21}J, calculate the temperature T. A) 304 K B) 456 K C) 31 K D) 31C E) 101 KFree

Multiple Choice

Q 52Q 52

The oxygen (molar mass = 32 g/mol) and nitrogen (molar mass = 28 g/mol) molecules in this room have equal average
A) kinetic energies, but the oxygen molecules are faster.
B) kinetic energies, but the oxygen molecules are slower.
C) kinetic energies and speeds.
D) speeds, but the oxygen molecules have a higher average kinetic energy.
E) speeds, but the oxygen molecules have a lower average kinetic energy.

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Multiple Choice

Q 53Q 53

Doubling the Kelvin temperature of a gas increases which of the following measures of its molecular velocity by a factor of 1.4?
A) the rms speed
B) the average speed
C) the most probable speed
D) All three of these speeds are correct.
E) None of these is correct.

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Multiple Choice

Q 54Q 54

Ethyl chloride (C

_{2}H_{5}Cl) is used as a refrigerant under certain circumstances. One mole of this substance contains Avogadro's number of A) carbon atoms. B) hydrogen atoms. C) chlorine atoms. D) All of these are correct. E) None of these is correct.Free

Multiple Choice

Q 55Q 55

A hailstorm causes an average pressure of 1.4 N/m

^{2}on the 200-m^{2}flat roof of a house. The hailstones, each of mass 7.0 10^{-3}kg, have an average velocity of 10 m/s perpendicular to the roof and rebound after hitting the roof with the same speed. How many hailstones hit the roof each second? A) 4000 B) 2000 C) 1000 D) 10 E) 800Free

Multiple Choice

Q 56Q 56

At room temperature, which of the following diatomic molecules has the greater average kinetic energy: carbon monoxide (molar mass = 28 g/mol), nitrogen (molar mass = 28 g/mol), or oxygen (molar mass = 32 g/mol)?
A) carbon monoxide
B) nitrogen
C) oxygen
D) Both a and b are correct.
E) All three have the same average kinetic energy.

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Multiple Choice

Q 57Q 57

At what Kelvin temperature does the rms speed of the oxygen (O

_{2}) molecules in the air near the surface of the earth become equal to the escape speed from the earth? (R = 8.31 J/mol · K; molar mass of O_{2}gas is 32 g/mol; radius of the earth R_{E}= 6.37 10^{6}m; the escape speed from the earth is 11.2 km/s) A) 4.8 10^{5}K B) 8.0 10^{4}K C) 1.6 10^{5}K D) 1.1 10^{4}K E) 3.6 10^{5}KFree

Multiple Choice

Q 58Q 58

If the absolute temperature of a gas is doubled, what is the change in the average kinetic energy of its molecules?
A) no change
B) increases by a factor of 2
C) decreases by a factor of 2
D) increases by a factor of
E) decreases by a factor of

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Multiple Choice

Q 59Q 59

If the absolute temperature of a gas is doubled, what is the change in the rms speed of its molecules?
A) no change
B) increases by a factor of 2
C) decreases by a factor of 2
D) increases by a factor of
E) decreases by a factor of

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Multiple Choice

Q 60Q 60

If you carry a sealed cylinder of oxygen to the moon, you should expect no change in the oxygen's
A) mass.
B) weight.
C) temperature.
D) pressure.
E) rms molecular velocity.

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Multiple Choice

Q 61Q 61

Which of the following is an assumption that is made in the kinetic theory of gases?
A) Molecules are not described by Newton's laws.
B) Molecules make up only a small fraction of the volume occupied by a gas.
C) Molecules collide inelastically.
D) The total number of molecules is actually very small.
E) There are forces acting on the molecules at all times.

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Multiple Choice

Q 62Q 62

Which of the following is NOT an assumption made in the kinetic theory model of a gas?
A) A gas consists of particles called molecules.
B) The molecules are in random motion and their behavior is described by Newton's laws.
C) The range of molecular forces is much greater than the molecular size.
D) Between collisions, molecules travel with constant speed and in a straight line.
E) Collisions are perfectly elastic and are of negligible duration.

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Multiple Choice

Q 63Q 63

A volume of an ideal gas goes through a temperature change from 20ºC to 60ºC. The relation between the average molecular kinetic energy at 20ºC (K

_{1}) and that at 60ºC (K_{2}) is A) K_{1}= K_{2 }B) K_{1}= 0.33 K_{2 }C) K_{1}= 3 K_{2 }D) K_{1}= 0.88 K_{2 }E) K_{1}= 1.14 K_{2 }Free

Multiple Choice

Q 64Q 64

When the temperature of an ideal gas is increased from 300 K to 400 K, the average kinetic energy of the gas molecules increases by a factor of
A) 1.15
B) 1.33
C) 1.54
D) 1.78
E) 2.47

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Multiple Choice

Q 65Q 65

Five molecules of a gas have the following speeds:
200 m/s,
300 m/s,
400 m/s,
500 m/s, and
600 m/s.
The rms speed for these molecules is
A) 300 m/s
B) 344 m/s
C) 400 m/s
D) 424 m/s
E) 534 m/s

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Multiple Choice

Q 66Q 66

On the basis of the kinetic theory of gases, when the absolute temperature is doubled, the average kinetic energy of the gas molecules changes by a factor of
A) 16
B) 2
C)
D) 4
E) 0.5

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Multiple Choice

Q 67Q 67

In a Maxwell-Boltzmann distribution function of molecular speeds, the rms speed is
A) always greater than the mean speed.
B) always less than the mean speed.
C) equal to the mean speed.
D) equal to the most probable speed.
E) independent of the temperature.

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Multiple Choice

Q 68Q 68

A room measures 3 m 4 m 2 m and is at 20C and 1 atm. Assuming that it only has the two diatomic gases, N

_{2}and O_{2}, the amount of kinetic energy in the gases is A) 3.6 MJ B) 6.1 MJ C) 0.25 MJ D) 0.41 MJ E) none of the aboveFree

Multiple Choice

Q 69Q 69

A room measures 3 m 4 m 2 m and is at 15C and 1 atm. Assuming that it only has the two diatomic gases, N

_{2}and O_{2}, how much heat is needed to increase the temperature to 25C? (Ignore the loss in air as the temperature heats up.) A) 8.4 10^{4}J B) 1.3 10^{5}J C) 1.7 10^{5}J D) 2.1 10^{5}J E) none of the aboveFree

Multiple Choice

Q 70Q 70

A 1 L container contains O

_{2}gas at STP. If the diameter of the O_{2}molecule is 3)75 10^{ }^{10}m, the mean free path of the O_{2}molecule is A) 5.96 10^{ }^{8}m B) 6.53 10^{ }^{8}m C) 4.57 10^{ }^{8}m D) 6.89 10^{ }^{8}m E) 7.67 10^{ }^{8}mFree

Multiple Choice

Q 71Q 71

A 1 L container contains O

_{2}gas at STP. If the diameter of the O_{2}molecule is 3.75 10^{ }^{10}m, the number of collisions per second is A) 6.7 10^{9}B) 6.1 10^{9}C) 8.1 10^{9}D) 7.1 10^{9}E) 1.0 10^{10}Free

Multiple Choice

Q 72Q 72

Two tanks, both of volume 10 L, are connected by a valve and are thermally isolated. One tank contains 1mole of

^{4}He at 280 K and the other tank contains 1 mole O_{2}at 300 K. The valve is then opened and the gases allowed to mix. What is the final temperature after the gases have come to equilibrium? A) 290 K B) 295 K C) 285 K D) 293 K E) 287 KFree

Multiple Choice

Q 73Q 73

The graph shows the Maxwell-Boltzmann distribution function of the number of gas molecules per unit speed range at a given temperature. The average speed, the most probable speed, and the rms speed (in this order) are most likely given by
A) x, y, z
B) z, x, y
C) y, z, x
D) y, x, z
E) z, y, x

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Multiple Choice

Q 74Q 74

The rms speed of oxygen molecules is 460 m/s at 0ºC. The molecular weight of oxygen is 8 times the molecular weight of helium. The rms speed of helium at 40ºC is approximately
A) 3.68 km/s
B) 1.84 km/s
C) 1.40 km/s
D) 880 m/s
E) 440 m/s

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Multiple Choice

Q 75Q 75

If the rms speed of oxygen molecules is 460 m/s at 0ºC, the rms speed of oxygen molecules at 273ºC is approximately
A) 230 m/s
B) 325 m/s
C) 650 m/s
D) 920 m/s
E) 1.84 km/s

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Multiple Choice

Q 76Q 76

If the rms speed of nitrogen molecules (molecular weight of N

_{2}is 28 g/mol) at 273 K is 492 m/s, the rms speed of oxygen molecules (molecular weight of O_{2}is 32 g/mol) at the same temperature is approximately A) 430 m/s B) 461 m/s C) 492 m/s D) 526 m/s E) 562 m/sFree

Multiple Choice

Q 77Q 77

The isotherm that corresponds to the highest temperature is the one labeled
A) T

_{1 }B) T_{2 }C) T_{3 }D) The isotherms correspond to the same temperature E) none of these is correctFree

Multiple Choice

Q 78Q 78

Use the following to answer questions :
-The figure shows the distribution of the molecular speeds of a gas for two different temperatures.
A) The curve labeled T

_{1}represents the distribution for the higher temperature molecules. B) The point labeled "1" corresponds to the rms speed of the molecules whose temperature is T_{1}. C) The point labeled "2" corresponds to the maximum speed of the molecules whose temperature is T_{1}. D) The point labeled "3" corresponds to the average speed of the molecules whose temperature is T_{1}. E) None of these is correct.Free

Multiple Choice

Q 79Q 79

Use the following to answer questions :
-The figure shows the distribution of the molecular speeds of a gas for two different temperatures.
A) The curve labeled T

_{2}represents the distribution for the higher temperature molecules. B) The point labeled "1" corresponds to the rms speed of the molecules whose temperature is T_{1}. C) The point labeled "2" corresponds to the maximum speed of the molecules whose temperature is T_{1}. D) The point labeled "3" corresponds to the average speed of the molecules whose temperature is T_{1}. E) None of these is correct.Free

Multiple Choice

Q 80Q 80

Use the following to answer questions :
-The figure shows the distribution of the molecular speeds of a gas for two different temperatures.
A) The curve labeled T

_{1}represents the distribution for the higher temperature molecules. B) The point labeled "1" corresponds to the maximum speed of the molecules whose temperature is T_{1}. C) The point labeled "2" corresponds to the maximum speed of the molecules whose temperature is T_{1}. D) The point labeled "3" corresponds to the average speed of the molecules whose temperature is T_{1}. E) None of these is correct.Free

Multiple Choice

Q 81Q 81

Use the following to answer questions :
-The figure shows the distribution of the molecular speeds of a gas for two different temperatures.
A) The curve labeled T

_{1}represents the distribution for the higher temperature molecules. B) The point labeled "1" corresponds to the rms speed of the molecules whose temperature is T_{1}. C) The point labeled "2" corresponds to the average speed of the molecules whose temperature is T_{1}. D) The point labeled "3" corresponds to the average speed of the molecules whose temperature is T_{1}. E) None of these is correct.Free

Multiple Choice

Q 82Q 82

Use the following to answer questions :
-The figure shows the distribution of the molecular speeds of a gas for two different temperatures.
A) The curve labeled T

_{1}represents the distribution for the higher temperature molecules. B) The point labeled "1" corresponds to the rms speed of the molecules whose temperature is T_{1}. C) The point labeled "2" corresponds to the maximum speed of the molecules whose temperature is T_{1}. D) The point labeled "3" corresponds to the rms speed of the molecules whose temperature is T_{1}. E) None of these is correct.Free

Multiple Choice

Q 83Q 83

The isotherm that corresponds to the lowest temperature is the one labeled
A) T

_{1 }B) T_{2 }C) T_{3 }D) The isotherms correspond to the same temperature. E) None of these is correct.Free

Multiple Choice

Q 84Q 84

A device used to measure the speed, v, of molecules is shown below. When the cylinder is rotated, only molecules that are of the right speed will pass through the slanted slot and be pickup by the detector. Drive an expression for the speed v in terms of the angular speed, , , and L. L is the length of the cylinder and is the angle subtended by the slanted slot.
A)
B)
C)
D)
E)

Free

Multiple Choice

Q 85Q 85

Two cylinders are connected by a small tube which has a needle valve in the middle. One cylinder contains

^{4}He gas, and the other cylinder contains CO_{2}gas. The gases are at the same temperature, pressure and volume. The lids that seal the gases in are free to move up or down. When the valve is opened, what happens to the volume in each cylinder? A) The volumes do not change. B) The CO_{2}volume decreases and the^{4}He increases. C) The CO_{2}volume increases and the^{4}He decreases. D) What happens depends on the initial temperature. E) What happens depends on the initial pressure.Free

Multiple Choice