Chapter 18527P18.62200AAcosφFHGIKJ=soφπ21260 031=FHGIKJ=°=−cos.Thus, the phase difference isπ=12023This phase difference results if the time delay isTfv3133==λTime delay 3000500..m32.00±mssbgP18.7(a)If the end is fixed, there is inversion of the pulse upon reflection. Thus, when they meet,they cancel and the amplitude is zero .(b)If the end is free, there is no inversion on reflection. When they meet, the amplitude is22 0 1500 300A..m maf.P18.8(a)∆x=+−=−=9 004 003 00133 000 606...mThe wavelength is=vf343300114msHzm.Thus,∆x06060530... ofawave,or∆20 5303 33afrad(b)For destructive interference, we want∆∆xfxv.where ∆xis a constant in this set up.fvx=234320606283∆.afHzP18.9We suppose the man’s ears are at the same level as the lower speaker. Sound from the upperspeaker is delayed by traveling the extra distance
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