JEE Advanced 2017 Physics question
A stationary source emits sound of frequency Hz. The sound is *reflected* by a large car *approaching* the source with a speed of 2 ms. The reflected signal is received by the source and superposed with the original. What will be the beat frequency of the resulting signal in Hz? (Given that the speed of sound in air is 330 ms and the car reflects the sound at the frequency *it* has received).
Answer: 6
Solution
The car (moving observer, approaching) receives ; it then acts as a source moving towards the stationary
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