JEE Advanced 2010 Physics question
A stationary source is emitting sound at a fixed frequency , which is reflected by two cars approaching the source. The difference between the frequencies of sound reflected from the cars is 1.2% of . What is the difference in the speeds of the cars (in km per hour) to the nearest integer ? The cars are moving at constant speeds much smaller than the speed of sound which is 330 .
Answer: 7
Solution
A car approaching the stationary source with speed v receives frequency (moving observer) and then acts as a moving source for the reflected sound, so the frequency received back at the source is f_0$ ≈ +
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