NEET 2012 Physics question
A train moving at a speed of towards a stationary object, emits a sound of frequency . Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is: (speed of sound in air is )
Answer: (4)
Solution
Step 1: the object is stationary and the source (train) moves towards it, so the frequency received by the object is . Step 2: the object now acts as a stationary source of
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