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Chapter 17: Q5PE (page 629)
Show that the speed of sound in air is 343 m/s , as claimed in the text.
The speed is343 m/s
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(a) A bat uses ultrasound to find its way among trees. If this bat can detect echoes 1.00ms apart, what minimum distance between objects can it detect? (b) Could this distance explain the difficulty that bats have to find an open door when they accidentally get into a house?
A spectator at a parade receives an\(888\;{\rm{Hz}}\)tone from an oncoming trumpeter who is playing an\(880\;{\rm{Hz}}\)note. At what speed is the musician approaching if the speed of sound is\({\rm{338}}\;{\rm{m/s}}\)?
It is more difficult to obtain a high-resolution ultrasound image in the abdominal region of someone who is overweight than for someone who has a slight build. Explain why this statement is accurate.
What frequencies will a 1.80 m long tube produce in the audible range at 20.0 C if:
(a) The tube is closed at one end?
(b) It is open at both ends?
Calculate the first overtone in an ear canal, which resonates like a 2.40 cm long tube closed at one end, by taking air temperature to be 37.0 C. Is the ear particularly sensitive to such a frequency? (The resonances of the ear canal are complicated by its nonuniform shape, which we shall ignore.)
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