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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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A crude approximation of voice production is to consider the breathing passages and mouth to be a resonating tube closed at one end. (See Figure17.30.) (a) What is the fundamental frequency if the tube is0.240 mlong, by taking air temperature to be37.0 C? (b) What would this frequency become if the person replaced the air with helium? Assume the same temperature dependence for helium as for air.
The factor of \({\rm{1}}{{\rm{0}}^{{\rm{ - 12}}}}\)in the range of intensities to which the ear can respond, from threshold to that causing damage after brief exposure, is truly remarkable. If you could measure distances over the same range with a single instrument and the smallest distance you could measure was\(1\;{\rm{mm}}\), what would the largest be?
What is the approximate sound intensity level in decibels of a \({\rm{600 Hz}}\) tone if it has a loudness of \({\rm{20 phons}}\)? If it has a loudness of \({\rm{70 phons}}\)?
What is the intensity in watts per meter squared of\(85.0\;{\rm{dB}}\)sound?
What frequency is received by a mouse just before being dispatched by a hawk flying at it at \(25.0\;{\rm{m/s}}\)and emitting a screech of frequency\({\rm{3500}}\;{\rm{Hz}}\)? Take the speed of sound to be\(331\;{\rm{m/s}}\).
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