MHT CET 2024 Physics question
A driver of a car travelling with a speed 'V' m/s towards a wall sounds siren of frequency 'n' Hz. If the velocity of sound in air is 'V' m/s then the frequency of the sound reflected form the wall and as heard by the driver in Hz is
Answer: (C)
Solution
Step 1: the wall is a stationary observer receiving sound from the approaching source (the car): . Step 2: the wall now acts as a stationary source of frequency and the driver is an observer moving towards it with speed : \dfrac${v +
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