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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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Calculate the speed of sound on a day when a 1500 Hz frequency has a wavelength of 0.221 m.
(a) Ear trumpets were never very common, but they did aid people with hearing losses by gathering sound over a large area and concentrating it on the smaller area of the eardrum. What decibel increase does an ear trumpet produce if its sound gathering area is\(900\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\)and the area of the eardrum is\(0.500\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\), but the trumpet only has an efficiency of\(5.00\% \)in transmitting the sound to the eardrum? (b) Comment on the usefulness of the decibel increase found in part (a)
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound intensity level goes up by\(40.0\;{\rm{dB}}\)?
(a) What frequency is received by a person watching an oncoming ambulance moving at\(110\;{\rm{km/h}}\)and emitting a steady\(800\;{\rm{Hz}}\)sound from its siren? The speed of sound on this day is\(345\;{\rm{m/s}}\). (b) What frequency does she receive after the ambulance has passed?
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?
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