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Chapter 17: Q46PE (page 630)
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.
The length of the tube is 1.56 m.
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(a) Find the length of an organ pipe closed at one end that produces a fundamental frequency of 256 Hz when air temperature is18.0C. (b)What is its fundamental frequency at 25.0 C?
Suppose a person has a \({\rm{50 - dB}}\)hearing loss at all frequencies. By how many factors of\({\rm{10}}\)will low-intensity sounds need to be amplified to seem normal to this person? Note that smaller amplification is appropriate for more intense sounds to avoid further hearing damage.
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\(331\;{\rm{m/s}}\).
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\({\rm{0}}{\rm{.300\% }}\).
What is the intensity in watts per meter squared of\(85.0\;{\rm{dB}}\)sound?
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