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Chapter 14: Problem 8
If you double the pressure of a gas while keeping its density the same, what happens to the sound speed?
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A heavy cable is hanging vertically, its bottom end free. How will the speed of transverse waves near the top and bottom of the cable compare? Why?
Red light emitted by hydrogen atoms at rest in the laboratory has wavelength \(656 \mathrm{~nm}\). Light emitted in the same process on a distant galaxy is received at Earth with wavelength \(708 \mathrm{~nm}\). Describe the galaxy's motion relative to Earth.
An ocean wave has period \(4.5 \mathrm{~s}\) and wavelength \(10.4 \mathrm{~m}\). Find its (a) wave number and (b) angular frequency.
Find the sound speed in air under standard conditions with pressure \(101 \mathrm{kN} / \mathrm{m}^{2}\) and density \(1.20 \mathrm{~kg} / \mathrm{m}^{3}\).
At a point \(12 \mathrm{~m}\) from a source of spherical sound waves, you measure the intensity as \(690 \mathrm{~mW} / \mathrm{m}^{2}\). How far do you need to walk, directly away from the source, until the intensity is \(260 \mathrm{~mW} / \mathrm{m}^{2} ?\)
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