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Chapter 17: Q38PE (page 595)
A 鈥渟howy鈥� custom-built car has two brass horns that are supposed to produce the same frequency but actually emit 263.8 Hz and 264.5 Hz. What beat frequency is produced?
The beat frequency is 0.7 Hz.
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A sound wave traveling in \(20\;{\rm{^\circ C}}\) air has pressure amplitude of\(0.5\;{\rm{Pa}}\). What is the intensity of the wave?
(a) Calculate the minimum frequency of ultrasound that will allow you to see details as small as 0.250mm in human tissue. (b) What is the effective depth to which this sound is effective as a diagnostic probe?
(a) Students in a physics lab are asked to find the length of an air column in a tube closed at one end that has a fundamental frequency of 256 Hz. They hold the tube vertically and fill it with water to the top, then lower the water while a 256 Hz tuning fork is rung and listen for the first resonance. What is the air temperature if the resonance occurs for a length of 0.336 m?
(b) At what length will they observe the second resonance (first overtone)?
A diagnostic ultrasound echo is reflected from moving blood and returns with a frequency\({\rm{500 Hz}}\)higher than its original\({\rm{2}}{\rm{.00 MHz}}\). What is the velocity of the blood? (Assume that the frequency of\({\rm{2}}{\rm{.00 MHz}}\)is accurate to seven significant figures and\({\rm{500 Hz}}\)is accurate to three significant figures.)
People with good hearing can perceive sounds as low in level as\( - 8.00\;{\rm{dB}}\)at a frequency of\(3000\;{\rm{Hz}}\). What is the intensity of this sound in watts per meter squared?
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