# Ch14 - Chapter 14 Sound CHAPTER 14 1 When a sine wave is...

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Chapter 14, Sound C HAPTER 14 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, moves 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. If the tension on a guitar string is increased by a factor of 3, the fundamental frequency at which it vibrates is changed by what factor? a. 9 b. 3 c. 3 d. 1/ 3 5. What phenomenon is created by two tuning forks, side by side, emitting frequencies, which differ by only a small amount? a. resonance b. interference c. the Doppler effect d. beats 6. The number of overtones, and their relative intensities, is associated with what property of the tone generated by a musical instrument? a. quality b. interference pattern c. range d. attack pattern 172

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Chapter 14, Sound 7. A 2.50-m-long organ pipe is open at one end and closed at the other. Its fundamental tone has wavelength: a. 1.25 m b. 5.00 m c. 10.0 m d. 16.25 m 8. Two vibrating tuning forks, held side by side, will create a beat frequency of what value if the individual frequencies of the two forks are 342 Hz and 345 Hz, respectively? a. 687 Hz b. 343.5 Hz c. 339 Hz d. 3 Hz 9. A train station bell gives off a fundamental tone of 500 Hz as the train approaches the station at a speed of 20 m/s. If the speed of sound in air is 335 m/s, what will be the apparent frequency of the bell to an observer riding the train? a. 532 Hz b. 530 Hz c. 470 Hz d. 472 Hz 10. 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. 11. The speed of sound in air is a function of which one of the following? a. wavelength b. frequency c. temperature d. amplitude 12. Tripling the power output from a speaker emitting a single frequency will result in what increase in loudness? a. 0.33 dB b. 3.0 dB c. 4.8 dB d. 9.0 dB 173
Chapter 14, Sound 13. Tripling the distance between sound source and a listener will change the intensity, as detected by the listener, by what factor? a. 1/9 b. 0.33 c. 3.0 d. 9.0 14. Doubling the tension in a guitar string will change its natural frequency by what factor? a. 0.71 b. 1.0 c. 1.4 d. 2.0 15. If I triple the mass per unit length of guitar string, its natural frequency changes by what factor? a. 0.58

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## This note was uploaded on 07/25/2008 for the course PHY 231C taught by Professor Pratt during the Spring '06 term at Michigan State University.

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Ch14 - Chapter 14 Sound CHAPTER 14 1 When a sine wave is...

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