Ch14_TestBank - Chapter 14, Sound CHAPTER 14 14.1 Producing...

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Chapter 14, Sound 198 C HAPTER 14 14.1 Producing a Sound Wave 1. When a sine wave is used to represent a sound wave, the crest corresponds to: a. rarefaction. b. condensation. c. point where molecules vibrate at a right angle to the direction of wave travel. d. region of low elasticity. 2. A sound wave coming from a tuba has a wavelength of 1.50 m and travels to your ears at a speed of 345 m/s. What is the frequency of the sound you hear? a. 517 Hz b. 1/517 Hz c. 230 Hz d. 1/230 Hz 3. A series of ocean waves, 5.0 m between crests, move past at 2.0 waves/s. Find their speed. a. 2.5 m/s b. 5.0 m/s c. 8.0 m/s d. 10 m/s 4. Consider a vibrating string that makes a sound wave that moves through the air. As the guitar string moves up and down, the air molecules that are a certain horizontal distance from the string will move: a. up and down. b. toward and away from the guitar string. c. back and forth along the direction of the length of the string. d. in circles around the guitar string. 14.2 Characteristics of Sound Waves 5. When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave)? a. perpendicular b. parallel c. anti-parallel (in opposite direction) d. Both choices B and C are valid.
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Chapter 14, Sound 199 6. Which of the following ranges corresponds to the longest wavelengths? a. infrasonic b. audible c. ultrasonic d. all have the same wavelengths 7. The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.) a. 1.7 cm b. 5.2 cm c. 34 cm d. 55 cm 8. Assuming that the wave speed varies little when sound waves are traveling though a material that suddenly changes density by 10%, what percentage of the incident wave intensity is reflected? a. < 1 % b. 5 % c. 10 % d. 20 % 14.3 The Speed of Sound 9. The speed of sound in air is a function of which one of the following? a. wavelength b. frequency c. temperature d. amplitude 10. The speed of sound at 0 ° C is 331 m/s. What is the speed of sound at 25 ° C? (0 ° C = 273 K) a. 346 m/s b. 356 m/s c. 343 m/s d. 350 m/s 11. The density of a certain metal solid is 7.2 × 10 3 kg/m 3 , and its Young’s modulus is 10 × 10 10 N/m 2 . What is the speed of sound in this metal? a. 1.4 × 10 7 m/s b. 5 900 m/s c. 3 700 m/s d. 3 000 m/s
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Chapter 14, Sound 200 12. How far away is a lightning strike if you hear the thunderclap 3.00 s after you see the lightning bolt strike? ( v sound = 340 m/s, v light = 3 × 10 8 m/s) a. 113 m b. 340 m c. 680 m d. 1 020 m 13. A sound wave in air has a frequency of 500 Hz and a wavelength of 0.68 m. What is the air temperature? a. –18°C
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This note was uploaded on 02/23/2010 for the course PHY 2043 taught by Professor Isac during the Fall '09 term at University of Florida.

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Ch14_TestBank - Chapter 14, Sound CHAPTER 14 14.1 Producing...

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