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Chapter 17: Q15PE (page 629)
What intensity level does the sound in the preceding problem correspond to?
The intensity level is \(84.5\;{\rm{dB}}\).
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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?
You are given two wind instruments of identical length. One is open at both ends, whereas the other is closed at one end. Which is able to produce
the lowest frequency?
Show that an intensity of \({10^{ - 12}}\;{\rm{W/}}{{\rm{m}}^{\rm{2}}}\) is the same as \({10^{ - 16}}\;{\rm{W/c}}{{\rm{m}}^{\rm{2}}}\) ?
If a woman needs an amplification of \({\rm{5 \times 1}}{{\rm{0}}^{{\rm{12}}}}{\rm{ W}} \cdot {{\rm{m}}^{{\rm{ - 2}}}}\) times the threshold intensity to enable her to hear at all frequencies, what is her overall hearing loss in dB? Note that smaller amplification is appropriate for more intense sounds to avoid further damage to her hearing from levels above\({\rm{90 dB}}\).
A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be\(0.400\;{\rm{s}}\). (a) How far away is the explosion if air temperature is\(24\;{\rm{^\circ C}}\)and if you neglect the time taken for light to reach the physicist? (b) Calculate the distance to the explosion taking the speed of light into account. Note that this distance is negligibly greater.
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