TB_chapter14 - Chapter 14, Sound CHAPTER 14 Conceptual...

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Chapter 14, Sound C HAPTER 14 Conceptual Problems C1. Which of the following best describes a sound level of intensity 1 W/m 2 ? a. extremely loud b. about that of a power mower c. normal conversation d. like a whisper C2. How far away is a lightning bolt if it takes 10 s for the sound of the associated thunder to reach the observer? a. 1 mile b. 2 miles c. 5 miles d. 10 miles C3. If the air temperature decreases, how does the resonant frequency in a pipe closed at one end change? a. It increases. b. It decreases. c. It doesn’t change since one end of the pipe is closed. d. It doesn’t change because resonance is pressure phenomenon. C4. A buzzer with frequency f 0 is thrown straight upwards. On the buzzer’s trip down, what is the frequency behavior heard by an observer below? a. The frequency heard is still f 0 . b. The frequency is a constant one greater than f 0. c. The frequency is an increasing one greater than f 0. d. The frequency is a decreasing one less than f 0. C5. The air in a pipe resonates at 150 Hz and 750 Hz, one of these resonances being the fundamental. If the pipe is open at both ends, how many resonances are between the two given ones, and if the pipe is closed at one end, how many resonances are between the two given ones? a. open: 3; closed: 1 b. open: 1; closed: 3 c. open: 2; closed: 0 d. open: 0; closed: 2 211
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Chapter 14, Sound 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. 212
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Chapter 14, Sound 6. Which of the following ranges corresponds to the longest wavelengths? a. infrasonic
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TB_chapter14 - Chapter 14, Sound CHAPTER 14 Conceptual...

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