JEE Main 2014 Physics question
A source of sound A emitting waves of frequency 1800 Hz is falling towards ground with a terminal speed v. The observer B on the ground directly beneath the source receives waves of frequency 2150 Hz. The source A receives waves, reflected from ground of frequency nearly: (Speed of sound = 343 m/s)
Answer: (2)
Solution
From the first Doppler shift, , giving and m/s. The ground reflects the wave it receives, so it
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