HW-CH179th Edition CH17 Problems: 20, 28, 52, 64, 1028th Edition CH17 Problems: 22, 26, 52, 62, 10620.Figure 17-38 shows four isotropic point sourcesof sound that are uniformly spaced on anxaxis.The sources emit sound at the same wavelength°and the same amplitudesm, and they emit inphase. A pointPis shown on thexaxis. Assumethat as the sound waves travel toP, the decreasein their amplitudes is negligible, What multipleofsmis the amplitude of the net wave atPifdistancedin the °gure is (a)°=4, (b)°=2, and(c)°?28.Two sounds di/er in sound level by 1.00 dB.What is the ratio of the greater intensity to thesmaller intensity?52.A tuning fork of unknown frequency makes 3.00beats per second with a standard fork of fre-quency 384 Hz.The beat frequency decreaseswhen a small piece of wax is put on a prong ofthe °rst fork. What is the frequency of this fork?64.A stationary detector measures the frequency of
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