Chapter 17515between your sound impulse reaching each riser and the next. Whatever its material, each willreflect much of the sound that reaches it. The reflected wave sounds very different from the sharppop you made. If there are twenty rows of seats, you hear from the bleachers a tone with twentycrests, each separated from the next in time by2 0 63400 004..mm ssafbg=.This is the extra time for it to cross the width of one seat twice, once as an incident pulse and onceagain after its reflection. Thus, you hear a sound of definite pitch, with period about 0.004 s, frequency10 003 5300.~sHzwavelengthλ===vf3403001 2100m ssmmbgbg.~and duration20 0 004101.~ssaf−.P17.52(a)λ===−vf3431 4800 2321m ssm.(b)β==LNMMOQPP−81 0101012.logdBdBW m2IIvssIv===×===×=×−−−−−−1010101 26101222 1 26101 2034341 4808 4110128 103 90422242128W mW mW mW mkgmm ssm22223ejejejbgej..maxmax....ρ ωρ ωπ(c)′ =′==−λvf3431 3970 2461m ssm.∆λλλ=′ −=13 8.mmP17.53Since cossin221θθ+=,sincosθθ= ±−12(each sign applying half the time)
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