Chapter 17517P17.57(a)′=−ffvvvdiverbgso 1−=′vvffdiver⇒=−′FHGIKJffdiver1with v=343 m s , f1 800 Hz and f=2150 Hzwe findvdiverms=−FHGIKJ=343 11800215055 8..(b)If the waves are reflected, and the skydiver is moving into them, we have′′ =′+⇒′′ =−LNMMOQPP+vvvdiverdiverdiverso ′′ =+−=f343 55 8343 55 82500..afafHz .P17.58(a)−ffvvu−−ffvaf′ −′′ =−−+FHGIKJfvvu vu11∆ffv v uv uuvfvuvf=+−+−=−=−ej2222121(b)13036 1km hm s=.∴=−=∆f2361 400340 136 134085 922...afHzP17.59When observer is moving in front of and in the same direction as the source, −−OSwhere vOand vSare measured relative to the medium in which the sound is propagated. In this case the
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