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Physics 202A Practice Problems - Ch. 12 (Waves and Sound) Answers to some of the questions are provided (choice shown in blue). However, you ought to still understand why a given answer is valid. You will need to work out the answers to those questions for which answers are not given. 1. A periodic wave travels along a stretched string in the direction shown by arrow. The sketch shows a "snapshot" of the pulse at a certain instant. Points A, B, and C are on the string. Which entry in the table below correctly describes how the particles of the string between A and B and between B and C are moving? between A and B between B and C (a) down down (b) up up (c) left right (d) up down (e) down up 2. The speed of sound in a certain metal block is 3.00 !! 10^3 m/s. The graph shows the amplitude (in meters) of a wave traveling through the block versus time (in milliseconds). What is the wavelength of this wave? (a) 0.5 m (c) 3.0 m (e) 6.0 m (b) 1.5 m (d) 4.0 m 3. Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 4.0 seconds. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Determine the speed of the waves. (a) 2.5 m/s (c) 14 m/s (e) 80 m/s (b) 5.0 m/s (d) 40 m/s 4. A certain string on a piano is tuned to produce middle C (f = 261.63 Hz) by carefully adjusting the tension in the string. For a fixed wavelength, what is the frequency when this tension is doubled? (a) 130.08 Hz (c) 370.00 Hz (e) 523.26 Hz (b) 185.00 Hz (d) 446.63 Hz 5. A steel wire of mass 0.400 kg and length 0.640 m supports a 102-kg block. The wire is struck exactly at its midpoint causing a small displacement. How long does it take the peak of this displacement to reach the top of the wire? (a) 2.00 !! 10^-3 s (b) 8.00 !! 10^-3 s (c) 4.00 !! 10^-3 s (d) 1.60 !! 10^-2 s

          Physics 202A Practice Problems - Ch. 12 (Waves and Sound)
Answers to some of the questions are provided (choice shown in blue). However, you ought to still understand why a given answer is valid. You will need to work out the answers to those questions for which answers are not given.

1. A periodic wave travels along a stretched string in the direction shown by arrow. The sketch shows a "snapshot" of the pulse at a certain instant. Points A, B, and C are on the string. Which entry in the table below correctly describes how the particles of the string between A and B and between B and C are moving?
between A and B	between B and C
(a) down		down
(b) up			up
(c) left		right
(d) up			down
(e) down		up

2. The speed of sound in a certain metal block is 3.00 !! 10^3 m/s. The graph shows the amplitude (in meters) of a wave traveling through the block versus time (in milliseconds). What is the wavelength of this wave?
(a) 0.5 m		(c) 3.0 m		(e) 6.0 m
(b) 1.5 m		(d) 4.0 m

3. Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 4.0 seconds. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Determine the speed of the waves.
(a) 2.5 m/s		(c) 14 m/s		(e) 80 m/s
(b) 5.0 m/s		(d) 40 m/s

4. A certain string on a piano is tuned to produce middle C (f = 261.63 Hz) by carefully adjusting the tension in the string. For a fixed wavelength, what is the frequency when this tension is doubled?
(a) 130.08 Hz		(c) 370.00 Hz		(e) 523.26 Hz
(b) 185.00 Hz		(d) 446.63 Hz

5. A steel wire of mass 0.400 kg and length 0.640 m supports a 102-kg block. The wire is struck exactly at its midpoint causing a small displacement. How long does it take the peak of this displacement to reach the top of the wire?
(a) 2.00 !! 10^-3 s	(b) 8.00 !! 10^-3 s	(c) 4.00 !! 10^-3 s	(d) 1.60 !! 10^-2 s

Physics 202A Practice Problems - Ch. 12 (Waves and Sound)
Answers to some of the questions are provided (choice shown in blue). However, you ought to still understand why a given answer is valid. You will need to work out the answers to those questions for which answers are not given.

1. A periodic wave travels along a stretched string in the direction shown by arrow. The sketch shows a "snapshot" of the pulse at a certain instant. Points A, B, and C are on the string. Which entry in the table below correctly describes how the particles of the string between A and B and between B and C are moving?
between A and B between B and C
(a) down down
(b) up up
(c) left right
(d) up down
(e) down up

2. The speed of sound in a certain metal block is 3.00 !! 10^3 m/s. The graph shows the amplitude (in meters) of a wave traveling through the block versus time (in milliseconds). What is the wavelength of this wave?
(a) 0.5 m (c) 3.0 m (e) 6.0 m
(b) 1.5 m (d) 4.0 m

3. Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 4.0 seconds. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Determine the speed of the waves.
(a) 2.5 m/s (c) 14 m/s (e) 80 m/s
(b) 5.0 m/s (d) 40 m/s

4. A certain string on a piano is tuned to produce middle C (f = 261.63 Hz) by carefully adjusting the tension in the string. For a fixed wavelength, what is the frequency when this tension is doubled?
(a) 130.08 Hz (c) 370.00 Hz (e) 523.26 Hz
(b) 185.00 Hz (d) 446.63 Hz

5. A steel wire of mass 0.400 kg and length 0.640 m supports a 102-kg block. The wire is struck exactly at its midpoint causing a small displacement. How long does it take the peak of this displacement to reach the top of the wire?
(a) 2.00 !! 10^-3 s (b) 8.00 !! 10^-3 s (c) 4.00 !! 10^-3 s (d) 1.60 !! 10^-2 s

Added by Christopher P.

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