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Chapter 17: Q15CQ (page 628)
Suppose you read that 210 bB ultrasound is being used to pulverize cancerous tumors. You calculate the intensity in watts per centimeter squared and find it is unreasonably high ( 105 W/cm2 ). What is a possible explanation?
High-intensity ultrasound can damage the cells they hit.
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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?
Is the Doppler shift real or just a sensory illusion?
If a sound intensity level of\(0\;{\rm{dB}}\)at\(1000\;{\rm{Hz}}\)corresponds to a maximum gauge pressure (sound amplitude) of\(1{0^{ - 9}}\;atm\), what is the maximum gauge pressure in a\(60\;{\rm{dB}}\)sound? What is the maximum gauge pressure in a\(120\;{\rm{dB}}\)sound?
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?
What is the intensity in watts per meter squared of\(85.0\;{\rm{dB}}\)sound?
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