Serway_PSE_quick_ch17

Serway_PSE_quick_ch17 - Physics for Scientists and...

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Unformatted text preview: Physics for Scientists and Engineers, 6e Chapter 17 Sound Waves The speed of sound in air is a function of 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. wavelength 2. frequency 3. temperature 4. amplitude Although the speed of a wave is given by the product of its wavelength (1) and frequency (2), it is not affected by changes in either one. The amplitude (4) of a sound wave determines the size of the oscillations of elements of air but does not affect the speed of the wave through the air. If you blow across the top of an empty soft-drink bottle, a pulse of sound travels down through the air in the bottle. At the moment the pulse reaches the bottom of the bottle, the correct descriptions of the displacement of elements of air from their equilibrium positions and the pressure of the air at this point are 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. the displacement and pressure are both at a maximum 2. the displacement and pressure are both at a minimum 3. the displacement is zero and the pressure is a maximum 4. the displacement is zero and the pressure is a minimum Because the bottom of the bottle is a rigid barrier, the displacement of elements of air at the bottom is zero. Because the pressure variation is a minimum or a maximum when the displacement is zero, and the pulse is moving downward, the pressure variation at the bottom is a maximum. An ear trumpet...
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Serway_PSE_quick_ch17 - Physics for Scientists and...

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