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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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Calculate the speed of sound on a day when a 1500 Hz frequency has a wavelength of 0.221 m.
What frequencies will a 1.80 m long tube produce in the audible range at 20.0 C if:
(a) The tube is closed at one end?
(b) It is open at both ends?
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.
Question: (a) What is the decibel level of a sound that is twice as intense as a \(90.0\;{\rm{dB}}\)sound? (b) What is the decibel level of a sound that is one-fifth as intense as a \(90.0\;{\rm{dB}}\)?
(a) Students in a physics lab are asked to find the length of an air column in a tube closed at one end that has a fundamental frequency of 256 Hz. They hold the tube vertically and fill it with water to the top, then lower the water while a 256 Hz tuning fork is rung and listen for the first resonance. What is the air temperature if the resonance occurs for a length of 0.336 m?
(b) At what length will they observe the second resonance (first overtone)?
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