Name: ______________________
Class: _________________
Date: _________
ID: A
Waves and Sound Quiz Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A weight on the end of a spring bobs up and down one complete cycle every 5.00 seconds. Its period is a. 0.20 sec. b. 5.00 sec. c. none of the above
7. An explosion occurs 340 km away. Given that sound travels at 340 m/s, the time the sound takes to reach you is a. 1 s. b. 10 s. c. 100 s. d. 200 s. e. more than 200 s.
2. Compared to the speed of light, sound travels a. faster. b. at about the same speed. c. slower.
8. Compared to the threshold of hearing, a sound level of 10 decibels is a. 1 times more intense. b. 20 times more intense. c. 200 times more intense. d. 10 times more intense.
3. Sound waves are produced by a. radio stations. b. vibrating objects. c. soft objects. d. objects under pressure. e. none of the above
9. You are water-skiing on a lake, and you are being pulled by a noisy motorboat. Another motor boat is speeding through the water a bit ahead of your boat so that rarefactions from its motor hit you when compressions from your boat’s motor hit you. You hear a. almost nothing due to constructive interference. b. almost nothing due to destructive interference. c. louder noise than if you were only listening to one boat. d. louder noise than if you were only listening to two boats.
4. A sound wave is a a. standing wave. b. longitudinal wave. c. transverse wave. d. shock wave. e. none of the above 5. Sound waves cannot travel in a. steel. b. air. c. a vacuum. d. water. e. Sound can travel in all of the above.
10. The Doppler effect is the change in observed frequency due to a. the original frequency of the source. b. the type of medium the wave is in. c. the motion of the source or observer. d. the type of wave. e. all of the above
6. Resonance occurs when a. sound changes speed in going from one medium to another. b. sound makes multiple reflections. c. the amplitude of a wave is amplified. d. an object is forced to vibrate at its natural frequency. e. all of the above
11. If you double the frequency of a vibrating object, its period a. halves. b. is quartered. c. doubles. 1
12. A weight suspended from a spring bobs up and back down again over a distance of 3.00 meters in 10.00 seconds. Its frequency is a. 0.10 hertz. b. 3.0 hertz. c. 10.0 hertz. d. none of the above
14. A skipper on a boat notices wave crests passing the anchor chain every 6.0 seconds. The skipper estimates the distance between crests at 30.0 m. What is the speed of the water waves? a. 5.0 m/s b. 6.0 m/s c. 30.0 m/s d. not enough information given
13. Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 200 megahertz is a. 0.7 m. b. 1.5 m. c. 6.7 m. d. 15 m.
15. An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic sound that travels 1530 m/s in seawater, and finds a 10-second time delay of the echo to the ocean floor and back. The ocean depth there is a. 1700 m. b. 3400 m. c. 7650 m. d. 15,300 m. e. none of the above
Problem 16. If you wished to produce a sound with a wavelength in air equal to the length of a 5-m room, what would its frequency be?
20. Sitting on the beach at Coney Island one afternoon, Kim finds herself beneath the flight path of the airplanes leaving JFK airport. What frequency will Kim hear as a jet, whose engines emit sound at a frequency of 1000 Hz, flies toward her at a speed of 100 m/s?
17. Miss Stein is told by her doctor that her heart rate is 70 beats per minute. If Miss Stein’s average blood flow in the aorta during systole is 1.5 x 10-2 m/s, what is the wavelength of the waves of bloo in Miss Stein’s aorta, created by her beating heart? 18. As an anchor is being hoisted out of the water, it hits the hull of the shio, causing the anchor to vibrate with a frequency of 150 Hz. If the speed of sound in sea water is 1520 m/s, how many wavelengths of sound will fit bewteen the boat and the ocean bottom 395 m below? 19. A police car, whose siren has frequency 1080 Hz, is traveling at 30 m/s. We are traveling at 50 m/s away from the police as he chases us. Find the frequency which we hear.
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ID: A
Waves and Sound Quiz Answer Section MULTIPLE CHOICE 1. ANS: STA: 2. ANS: STA: 3. ANS: STA: 4. ANS: STA: 5. ANS: STA: 6. ANS: STA: 7. ANS: STA: 8. ANS: STA: BLM: 9. ANS: STA: BLM: 10. ANS: STA: 11. ANS: STA: 12. ANS: STA: 13. ANS: STA: BLM: 14. ANS: STA: BLM: 15. ANS: STA:
B PTS: Ph.4.f KEY: C PTS: Ph.4.d KEY: B PTS: Ph.4.d KEY: B PTS: Ph.4.d KEY: C PTS: Ph.4.d KEY: D PTS: Ph.4.f KEY: E PTS: Ph.4.d KEY: D PTS: Ph.4.c | Ph.4.d comprehension B PTS: Ph.4.f KEY: application C PTS: Ph.1.m KEY: A PTS: Ph.4.f KEY: A PTS: Ph.4.f KEY: B PTS: Ph.4.c | Ph.4.d application A PTS: Ph.4.c | Ph.4.d application C PTS: Ph.4.d KEY:
1 DIF: L2 OBJ: weight | cycle | period BLM: 1 DIF: L2 OBJ: speed | light | sound BLM: 1 DIF: L1 OBJ: sound | vibration BLM: 1 DIF: L1 OBJ: longitudinal | wave BLM: 1 DIF: L1 OBJ: vacuum | travel BLM: 1 DIF: L1 OBJ: resonance | frequency BLM: 1 DIF: L2 OBJ: time | distance BLM: 1 DIF: L2 OBJ: KEY: decibel | intensity
25.2 Wave Description application 26.4 Speed Of Sound comprehension 26.1 The Origin Of Sound knowledge 26.1 The Origin Of Sound knowledge 26.3 Media That Transmit Sound knowledge 26.8 Resonance knowledge 26.4 Speed Of Sound application 26.5 Loudness
1 DIF: L2 OBJ: 26.9 Interference interference | constructive interference | destructive interference 1 DIF: L1 Doppler | frequency 1 DIF: L2 frequency | vibrate | period 1 DIF: L2 weight | spring | distance 1 DIF: L2 KEY: wave | radio | 1
OBJ: BLM: OBJ: BLM: OBJ: BLM: OBJ: hertz
25.9 The Doppler Effect knowledge 25.2 Wave Description application 25.2 Wave Description application 25.4 Wave Speed
DIF: L2 OBJ: 25.4 Wave Speed KEY: distance | speed
1 DIF: L2 ultrasonic | echo
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OBJ: 26.4 Speed Of Sound BLM: application
ID: A PROBLEM 16. ANS: 68 Hz PTS: 1 STA: Ph.4.d 17. ANS: 0.0129 m
DIF: L2 OBJ: 26.4 Speed Of Sound KEY: wavelength | frequency BLM: application
PTS: 1 18. ANS: 38 wavelengths PTS: 1 19. ANS: 1008 Hz PTS: 1 20. ANS: 1417 Hz PTS: 1
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