MHT CET Physics question
An obstacle is moving towards the source with velocity . The sound is reflected from the obstacle. If is the speed of sound and is the wavelength, then the wavelength of the reflected wave is [MHTCET 2021, MHTCET 2021]
Answer: (A)
Solution
The obstacle receives frequency and re-emits it as a source moving towards the source, so the reflected frequency is and $λ' =
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