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An engine whistling at a constant frequency `n_(0)` and moving with a constant velocity goes past a stationery observer. As the engine crosses him, the frequency of the sound heard by 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 isA. `(1)/(2)n_(0)(1-f^(2))`B. `(1)/(2)n_(0)((1-f^(2))/(f))`C. `n_(0)((1-f)/(1+f))`D. `(1)/(2)n_(0)((1-f)/(1+f))` |
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Answer» Correct Answer - B |
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