Physics Study Set 2

Physics & Astronomy

Quiz 14 :
Waves and Sound

Quiz 14 :
Waves and Sound

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Give at least one example of each of the following: (a) longitudinal standing wave. (b) transverse standing wave.
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Answer:

(a)sound wave resonating in an organ pipe
(b)vibrating string on a violin

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A uniform rope hangs from a ceiling. Without tugging on the rope, you give the bottom of the rope a wiggle and a wave travels upward along the rope. What can you say about the speed of the wave as the wave travels up the rope?
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Answer:

The speed increases because the tension is increasing.

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Write an expression for a harmonic wave that has an amplitude of 18 cm, a wavelength of 2.0 m, and propagates to the left at 15 m/s.
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Answer:

y(x,t)= (18 cm)cos[(3.1 img )x + (47 img )t] or
y(x,t)= (18 cm)cos[((2π/2.0) img )x + ((2π × 7.5) img )t]

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What is the audible range of sound frequencies?
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In western movies you often see a person putting his ear against the rails in the train tracks to find out if a train is approaching. Why would this give him advance knowledge of the approach of a train?
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Sound waves in air are transverse waves.
True False
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A wave pulse on a string whose end is fixed is reflected without inversion.
True False
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Bats use infrasound to navigate.
True False
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Infrasound carries over long distances better than ultrasound.
True False
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FIGURE 14-1 img -In Figure 14-1, the wavelength is
Multiple Choice
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FIGURE 14-1 img -In Figure 14-1, the frequency is
Multiple Choice
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A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thicker and heavier. What is the orientation of the reflected and transmitted pulses?
Multiple Choice
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Two strings are made of the same material. String 1 has radius r1 while string 2 has radius r2 = r1/2. When stretched by the same tension, the respective speed of propagation of waves v1 and v2 satisfy the condition
Multiple Choice
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Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves travel in the +x direction?
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Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves have the same speed?
Multiple Choice
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Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves have the same period?
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As the temperature of the air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)
Multiple Choice
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The pitch of a sound is determined by
Multiple Choice
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Seven seconds after a brilliant flash of lightning, thunder shakes the house. How far was the lightning strike from the house?
Multiple Choice
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Sound vibrations with frequencies less than 20 Hz are called
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