# Quiz 41: Atomic Physics

Physics & Astronomy

39

All Questions

37

Multiple Choice

0

True False

1

Essay

1

Short Answer

0

Not Answered

Q 1

Consider the four quantum numbers of an electron in an atom, n, l, m

_{l}, and m_{s}. The energy of an electron in an isolated atom depends on A) n only. B) n and l only. C) n, l, and m_{l}only. D) l, m_{l}, and m_{s}only. E) all four quantum numbers.Free

Multiple Choice

A

Q 2

For each value of the principal quantum number n, what are the possible values of the electron spin quantum number m

_{s}? (There may be more than one correct choice.) A) 0 B) +1/2 C) -1/2 D) +3/2 E) -3/2Free

Multiple Choice

B, C

Q 3

Which of the following are characteristics of laser light? (There may be more than one correct choice.)
A) It is coherent.
B) It is produced by an inverted population of atoms.
C) It contains a full spectrum of wavelengths.

Free

Multiple Choice

A, B

Q 4

An electron in a hydrogen atom is in the n = 7 shell. How many possible values of the orbital quantum number l could it have?
A) 6
B) 7
C) 15
D) 33
E) 98

Multiple Choice

Q 5

An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number m

_{l}could it have? A) 6 B) 7 C) 15 D) 33 E) 98 Multiple Choice

Q 6

An electron in a hydrogen atom has principal quantum number n = 4. How many possible values of the orbital quantum number l could it have?
A) 8
B) 9
C) 3
D) 4
E) 10

Multiple Choice

Q 7

An electron in a hydrogen atom has orbital quantum number l = 4. How many possible values of the magnetic quantum number m

_{l}could it have? A) 4 B) 10 C) 5 D) 9 E) 3 Multiple Choice

Q 8

If the orbital quantum number is l = 4, which one of the following is a possible value for the principal quantum number n?
A) 1
B) 2
C) 3
D) 4
E) 8

Multiple Choice

Q 9

If the principal quantum number of an electron is n = 5, which one of the following is NOT an allowed magnetic quantum number m

_{l}for the electron? A) 0 B) 2 C) 3 D) 4 E) 5 Multiple Choice

Q 10

If an electron has spin quantum number m

_{s}= - what is the possible value for the orbital quantum number l of the electron? A) 0 B) 1 C) 2 D) 11 E) All of the above numbers are possible. Multiple Choice

Q 11

In the ground state, the quantum numbers (n, l, m

_{l}, m_{s}) for hydrogen are, respectively A) 1, 1, 1, 1 B) 1, 0, 0, 0 C) 1, 0, 0, ± D) 1, 1, 1, ± E) 1, 1, 0, ± Multiple Choice

Q 12

The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 5 state?
A) 2.72 eV
B) -2.72 eV
C) 0.544 eV
D) -0.544 eV
E) -68 eV

Multiple Choice

Q 13

What is the energy of an incident photon that is just enough to excite a hydrogen atom from its ground state to its n = 4 state?
A) 12.75 eV
B) 10.20 eV
C) 3.40 eV
D) 0.85 eV

Multiple Choice

Q 14

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10

^{-19}J, m_{h}≈ m_{proton}= 1.67 × 10^{-27}kg) A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s Multiple Choice

Q 15

What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10

^{-19}J, m_{h}≈ m_{proton}= 1.67 × 10^{-27}kg) A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s Multiple Choice

Q 16

The normalized wave function for a hydrogen atom in the 1s state is given by ψ(r) = e

^{-}^{r/α}_{0}where α_{0 }is the Bohr radius, which is equal to 5.29 × 10^{-11}m. What is the probability of finding the electron at a distance greater than 7.8 α_{0}from the proton? A) 2.3 × 10^{-5}B) 1.2 × 10^{-5}C) 1.7 × 10^{-5}D) 4.6 × 10^{-5}E) 3.5 × 10^{-5} Multiple Choice

Q 17

What is the greatest magnitude of the orbital angular momentum L for an electron in a state with principal quantum number n = 5?
A) 4.47
B) 4.90
C) 5
D) 5.48

Multiple Choice

Q 18

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. What is the orbital quantum number l of the electron?
A) 1
B) 2
C) 3
D) 4
E) 5

Multiple Choice

Q 19

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which one of the following numbers could be the principal quantum number n of the electron?
A) 0
B) 1
C) 2
D) 3
E) 4

Multiple Choice

Q 20

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?
A) 107°
B) 90.0°
C) 73.2°
D) 54.7°
E) 0.00°

Multiple Choice

Q 21

How many electrons can be found with principal quantum number n = 3 in a suitably heavy atom?
A) 18
B) 6
C) 20
D) 9

Multiple Choice

Q 22

An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. What is the magnitude of the orbital angular momentum L of the atom?
A) 1.0ħ
B) 1.2ħ
C) 1.4ħ
D) 1.7ħ
E) 2.0ħ

Multiple Choice

Q 23

An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. A magnetic field is applied, defining the z-axis along the field. Which of the following sets of angles are possible angles between the magnetic field and the orbital angular momentum?
A) 45°
B) 90°
C) 45°, 90°
D) 45°, 135°
E) 45°, 90°, 135°

Multiple Choice

Q 24

The only VALID electron state and shell designation among the following is
A) 1p, K.
B) 2s, K.
C) 1s, L.
D) 2p, L.
E) 3f, M.

Multiple Choice

Q 25

The only INVALID electron state and shell designation among the following is
A) 1s, K.
B) 2s, L.
C) 2d, L.
D) 3s, M.
E) 3d, M.

Multiple Choice

Q 26

The correct ground state electron configuration of boron, which has 5 electrons, is
A) 1s

^{2}2s^{2}2p. B) 1s^{2}2s^{2}2p^{3}. C) 1s^{2}1p^{2}2s. D) 1s^{2}2p^{2}3s. E) 1s^{2}2p^{3}. Multiple Choice

Q 27

Consider the n = 9 shell.
(a) What is the largest value of the orbital quantum number, l, in this shell?
(b) How many electrons can be placed in this shell?

Essay

Q 28

An atom with 5 electrons is in its ground state. How many electrons are in its outermost shell?

Short Answer

Q 29

How many electrons does it take to fill the d subshell?
A) 10
B) 6
C) 14
D) 4
E) 8

Multiple Choice

Q 30

How many possible sets of quantum numbers (electron states) are there in the 5f subshell?
A) 2
B) 6
C) 8
D) 10
E) 14

Multiple Choice

Q 31

A neutral atom has an electron configuration of 1s

^{2}2s^{2}2p^{6}3s^{2}3p^{2}. How many protons does it have in its nucleus? A) 5 B) 11 C) 14 D) 20 E) 26 Multiple Choice

Q 32

What is the electron configuration for ground state Li, which has 3 electrons?
A) 1s

^{3}B) 1s^{1}2s^{2}C) 1s^{2}2s^{1}D) 1s^{2}1p^{1}E) 1s^{1}1p^{2} Multiple Choice

Q 33

What is the correct electronic configuration for ground state carbon, which has 6 electrons?
A) 1s

^{2}2s^{2}2p^{2}B) 1s^{1}2p^{1}C) 1s^{1}2s^{2}2p^{1}D) 1s^{1}2s^{1}2p^{1}E) 1s^{2}2s^{2}2p^{4} Multiple Choice

Q 34

What is the correct electronic configuration for the ground state sodium atom, which has 11 electrons?
A) 1s

^{1}2s^{2}3p^{6}2s^{2}B) 1s^{2}2s^{1}3p^{6}2s^{2}C) 1s^{1}2s^{2}2p^{6}D) 1s^{2}2s^{2}2p^{6}3s^{2}E) 1s^{2}2s^{2}2p^{6}3s^{1} Multiple Choice

Q 35

A collection of atoms has 20% of the sample in a state 5.9 eV above the ground state. If these emit coherent radiation, what is the wavelength of the laser light produced? (c = 3.00 × 10

^{8}m/s, H = 6.626 × 10^{-34}J ∙ s, 1 eV = 1.60 × 10^{-19}J) A) 210 nm B) 91 nm C) 340 nm D) 34 nm Multiple Choice

Q 36

How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm?
(c = 3.00 × 10

^{8}m/s, h = 6.626 × 10^{-34}J ∙ s) A) 6.09 × 10^{15}photons/s B) 5.03 × 10^{12}photons/s C) 3.07 × 10^{15}photons/s D) 3.07 × 10^{13}photons/s Multiple Choice

Q 37

You need 14 W of infrared laser light power with wavelength 1270 nm to bore a hole in a diamond. How many downward atomic transitions per second must occur in the laser if all of them result in light directed onto the diamond? (c = 3.00 × 10

^{8}m/s, h = 6.626 × 10^{-34}J ∙ s) A) 8.9 × 10^{19}B) 8.9 × 10^{18}C) 5.9 × 10^{19}D) 2.7 × 10^{18} Multiple Choice

Q 38

The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 10

^{8}m/s, h = 6.626 × 10^{-34}J ∙ s, 1 eV = 1.6022 × 10^{-19}J) A) 1.537 eV B) 1.646 eV C) 1.786 eV D) 1.812 eV E) 3.572 eV Multiple Choice

Q 39

In a ruby laser, an electron jumps from a higher energy level to a lower one. If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon?
(c = 3.00 × 10

^{8}m/s, h = 6.626 × 10^{-34}J ∙ s, 1 eV = 1.60 × 10^{-19}J) A) 350 nm B) 470 nm C) 650 nm D) 690 nm E) 960 nm Multiple Choice