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Consider a souce of sound S, and an obse...

Consider a souce of sound `S`, and an observer/detector `D`. The source emits a sound wave of frequency `f_0`. The frequency observed by `D` is found to be (i) `f_1`, if `D` approaches `S` and `S` is stationary
(ii) `f_2`, if `S` approaches `S` and `S` is stationary
(iii) `f_3`,if both `S` and `D` and `D` is stationary Speed
In all three cases, relative velocity of `S` wrt `D` is the same. For this situation which is incorrect?

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