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Chapter 17: Q1PE (page 630)
When poked by a spear, an operatic soprano lets out a 1200 Hz shriek. What is its wavelength if the speed of sound is 345 m/s?
0.29 m is the required wavelength.
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What is the intensity in watts per meter squared of\(85.0\;{\rm{dB}}\)sound?
If a woman needs an amplification of \({\rm{5 \times 1}}{{\rm{0}}^{{\rm{12}}}}{\rm{ W}} \cdot {{\rm{m}}^{{\rm{ - 2}}}}\) times the threshold intensity to enable her to hear at all frequencies, what is her overall hearing loss in dB? Note that smaller amplification is appropriate for more intense sounds to avoid further damage to her hearing from levels above\({\rm{90 dB}}\).
It is more difficult to obtain a high-resolution ultrasound image in the abdominal region of someone who is overweight than for someone who has a slight build. Explain why this statement is accurate.
Is the Doppler shift real or just a sensory illusion?
By what fraction will the frequencies produced by a wind instrument change when air temperature goes from \({\rm{10}}{\rm{.0^\circ C}}\) to \({\rm{30}}{\rm{.0^\circ C}}\)? That is, find the ratio of the frequencies at those temperatures.
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