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Chapter 17: Q3PE (page 629)
Calculate the speed of sound on a day when a 1500 Hz frequency has a wavelength of 0.221 m.
The speed is 331.5 m/s.
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When you hear a sonic boom, you often cannot see the plane that made it. Why is that?
Suppose you read that 210 bB ultrasound is being used to pulverize cancerous tumors. You calculate the intensity in watts per centimeter squared and find it is unreasonably high ( 105 W/cm2 ). What is a possible explanation?
a) How much more intense is a sound that has a level \(17.0\;{\rm{dB}}\)higher than another? (b) If one sound has a level \(23.0\;{\rm{dB}}\) less than another, what is the ratio of their intensities?
(a) If a submarine’s sonar can measure echo times with a precision of \(0.0100\;s\), what is the smallest difference in distances it can detect? (Assume that the submarine is in the ocean, not in fresh water.) (b) Discuss the limits this time resolution imposes on the ability of the sonar system to detect the size and shape of the object creating the echo.
What length should an oboe have to produce a fundamental frequency of 110 Hz on a day when the speed of sound is 343 m/s? It is open at both ends.
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