JEE Main 2015 Physics question
A bat moving at m s towards a wall sends a sound signal of Hz towards it. On reflection, it hears a sound of frequency . The value of in Hz is close to (speed of sound m s)
Answer: (4)
Solution
Apply the Doppler formula twice. First, the wall is a stationary observer and the bat a moving source, so the wall receives . The wall then re-radiates as a stationary source, and the bat is a moving observer approaching it, so the bat
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