Chapter 13 Pretest Sound

1. Which of the following is not a physical property of sound waves 1. Which of the following is not a physical property of sound waves? A) intensity, B) quality, C) harmonic content, D) frequency.

1. Which of the following is not a physical property of sound waves 1. Which of the following is not a physical property of sound waves? A) intensity, B) quality, C) harmonic content, D) frequency.

2. The fundamental sounded by a piano string has a frequency of 220 Hz 2. The fundamental sounded by a piano string has a frequency of 220 Hz. The frequency which cannot be harmonic is: A) 220 Hz, B) 330 Hz, C) 440 Hz, D) 660 Hz.

2. The fundamental sounded by a piano string has a frequency of 220 Hz 2. The fundamental sounded by a piano string has a frequency of 220 Hz. The frequency which cannot be harmonic is: A) 220 Hz, B) 330 Hz, C) 440 Hz, D) 660 Hz.

3. For a closed tube, the approximate relationship between its fundamental resonant frequency and its length is: A) l = L, B) l = 2L, C) l = 4L, D) l = 8L.

3. For a closed tube, the approximate relationship between its fundamental resonant frequency and its length is: A) l = L, B) l = 2L, C) l = 4L, D) l = 8L.

4. When two tuning forks, 132 Hz and 137 Hz, are sounded simultaneously, the number of beats per second is: A) 5, B) 132, C) 137, D) 269.

4. When two tuning forks, 132 Hz and 137 Hz, are sounded simultaneously, the number of beats per second is: A) 5, B) 132, C) 137, D) 269.

5. The resonant frequencies of an open tube are harmonics: A) but only the fundamental, second, and third harmonic are present, B) but only even harmonics of the fundamental are present, C) but only odd harmonics of the fundamental are present, D) and all harmonics of the fundamental are present.

5. The resonant frequencies of an open tube are harmonics: A) but only the fundamental, second, and third harmonic are present, B) but only even harmonics of the fundamental are present, C) but only odd harmonics of the fundamental are present, D) and all harmonics of the fundamental are present.

6. How high or low we perceive a sound to be, depending on the frequency of the sound wave is defined as the: A. infrasonic wave. B. frequency. C. ultrasonic wave. D. pitch.

6. How high or low we perceive a sound to be, depending on the frequency of the sound wave is defined as the: A. infrasonic wave. B. frequency. C. ultrasonic wave. D. pitch.

7. The Doppler effect occurs with:. A. only sound waves. B 7. The Doppler effect occurs with: A. only sound waves. B. only compressional waves. C. only water waves. D. all waves.

7. The Doppler effect occurs with:. A. only sound waves. B 7. The Doppler effect occurs with: A. only sound waves. B. only compressional waves. C. only water waves. D. all waves.

8. The effects of sound on the ear are loudness, pitch, and quality 8. The effects of sound on the ear are loudness, pitch, and quality. Loudness is an effect of _____, pitch is an effect of _____, and timbre is an effect of _____. A. intensity; harmonic content; frequency B. harmonic content; frequency; intensity C. frequency; intensity; harmonic content D. intensity; frequency; harmonic content

8. The effects of sound on the ear are loudness, pitch, and quality 8. The effects of sound on the ear are loudness, pitch, and quality. Loudness is an effect of _____, pitch is an effect of _____, and timbre is an effect of _____. A. intensity; harmonic content; frequency B. harmonic content; frequency; intensity C. frequency; intensity; harmonic content D. intensity; frequency; harmonic content

9. What phenomenon is created by two tuning forks side by side that emit frequencies that differ by only a small amount? A. resonance B. interference C. the Doppler effect D. beats

9. What phenomenon is created by two tuning forks side by side that emit frequencies that differ by only a small amount? A. resonance B. interference C. the Doppler effect D. beats

1. What is the temperature of the air if a sound wave, frequency 523 1. What is the temperature of the air if a sound wave, frequency 523.0 Hz, has a wavelength of 0.651 0 m?

v = f l v = 523 x 0.6510 340.5 m/s

2. If sound speed in air is 345 m/s, what is the wavelength of the waves produced by a 264 Hz tuning fork?

v = f l 345 = 264 x l l = 1.31 m

3. A locomotive horn has a frequency of 250 Hz 3. A locomotive horn has a frequency of 250 Hz. How will this sound to a stationary listener as the train passes?

The pitch will abruptly drop from above 250 Hz to below 250 Hz.

4. What is the approximate length of a closed tube that resonates with a sound wave that has a wavelength of 78.0 cm?

Closed tube l = 4L l = 4L 78.0 cm = 4L 19.5 cm = L

5. Sonar travels through water at about 1300 m/s. If there is a 0 5. Sonar travels through water at about 1300 m/s. If there is a 0.5 second delay between the production of the sound and the echo, how far is the submarine from the torpedo? If the sound of the echo has a lower frequency than the original sound, what does that indicate to the people in the sub?

v = d/t vt = d 1300 x 0.5 = 650 m (round trip) 650/2 = 325 m The lower frequency indicates the torpedo is moving away from the sub, good news.

6. Which carries a sound wave more rapidly, a solid or a gas?

Solid, because it is denser.