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[" An engine whistling at a constant fre...

[" An engine whistling at a constant frequency "n_(0)" and moving with a constant velocity goes past a stationary "],[" observer.As the engine crosses him,the frequency of the sound him changes by a factor "f." The "],[" actual difference in the frequencies of the sound heard by him before and after the engine crosses him is "],[" actual difference in the frequencies of the sound heard by him before and after the engine crosses him is "],[" (A) "(1)/(2)n_(0)(1-f^(2))quad " (B) "(1)/(2)n_(0)((1-f^(2))/(f))quad " (C) "n_(0)((1-f)/(1+f))quad " (D) "(1)/(2)n_(0)((1-f)/(1+f))]

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