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Halliday 2 Cap 18 - P18 048

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    December 2018

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48. The Doppler effect formula, Eq. 18-47, and its accompanying rule for choosing ± signs, are discussed in §18-8. Using that notation, we have v = 343 m/s, vD = 2.44 m/s, f  = 1590 Hz and f = 1600 Hz. Thus,   v + vD f  f =f =⇒ vS =  (v + vD ) − v = 4.61 m/s . v + vS f