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42. An ambulance moves at a speed of 50 km/hr, and its siren emitting sound at a frequency of 5.0x102 Hz. What frequency of sound is heard by a runner who is running at 4 m/s approaching each other in the opposite direction (the speed of sound in air is 345 m/s)?
(A) 47 Hz
(B) 475 Hz
(C) 506 Hz
(D) 527 Hz
(E) 555 Hz

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wynette 高三上 (2019/07/18)
都卜勒效應 兩物體間有相對運動 相........


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2F
面試倒楣鬼-22幸運上後西 大二上 (2021/04/10)

  50 km/hr ~= 14m/s , F' = F(345+4)/(345-14) = F(349/331)~=1.05F ~= 527 (D)


42. An ambulance moves at a speed of 50 ..-阿摩線上測驗