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Chapter 17: Q2PE (page 629)
What frequency sound has a 0.10 m wavelength when the speed of sound is 340 m/s?
The frequency is f = 3400 Hz
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(a) What is the fundamental frequency of a 0.672 m long tube, open at both ends, on a day when the speed of sound is 344 m/s? (b) What is the frequency of its second harmonic?
Show that the speed of sound in air is 343 m/s , as claimed in the text.
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound intensity level goes up by\(40.0\;{\rm{dB}}\)?
Sound is more effectively transmitted into a stethoscope by direct contact than through the air, and it is further intensified by being concentrated on the smaller area of the eardrum. It is reasonable to assume that sound is transmitted into a stethoscope\(100\)times as effectively compared with transmission though the air. What, then, is the gain in decibels produced by a stethoscope that has a sound gathering area of\(15.0\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\), and concentrates the sound onto two eardrums with a total area of\(0.900\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\)with an efficiency of\(40.0\% \)?
if a large housefly\(3.0\;{\rm{m}}\)away from you makes a noise of\(40.0\;{\rm{dB}}\), what is the noise level of\(1000\)flies at that distance, assuming interference has a negligible effect?
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