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Chapter 17: Q7CQ (page 628)
When you hear a sonic boom, you often cannot see the plane that made it. Why is that?
We cannot see the plane because speed of the plane was greater than the speed of sound.
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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.
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.
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.
Can you perceive the shift in frequency produced when you pull a tuning fork toward you at\({\rm{10}}{\rm{.0}}\;{\rm{m/s}}\)on a day when the speed of sound is \({\rm{344}}\;{\rm{m/s}}\)? To answer this question, calculate the factor by which the frequency shifts and see if it is greater than\({\rm{0}}{\rm{.300\% }}\).
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