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Chapter 17 - Chapter 17 WAVES II 1 The speed of a sound...

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Chapter 17: WAVES – II 1. The speed of a sound wave is determined by: A. its amplitude B. its intensity C. its pitch D. number of harmonics present E. the transmitting medium ans: E 2. Take the speed of sound to be 340 m / s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is: 3. A sound wave has a wavelength of 3 . 0 m. The distance from a compression center to the adjacent rarefaction center is: A. 0 . 75 m B. 1 . 5 m C. 3 . 0 m D. need to know wave speed E. need to know frequency ans: B 4. A fi re whistle emits a tone of 170 Hz. Take the speed of sound in air to be 340 m / s. The wavelength of this sound is about: 5. During a time interval of exactly one period of vibration of a tuning fork, the emitted sound travels a distance: 256 Chapter 17: WAVES – II
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6. At points in a sound wave where the gas is maximally compressed, the pressure A. is a maximum B. is a minimum C. is equal to the ambient value D. is greater than the ambient value but less than the maximum E. is less than the ambient value but greater than the minimum ans: A 7. You are listening to an “A” note played on a violin string. Let the subscript “s” refer to the violin string and “a” refer to the air. Then: A. f s = f a but λ s W = λ a B. f s = f a and λ s = λ a C. λ s = λ a but f s W = f a D. λ s W = λ a and f s W = f a E. linear density of string = volume density of air ans: A 8. “Beats” in sound refer to: 9. To produce beats it is necessary to use two waves:
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