JEE Main 2016 Physics question
Two engines pass each other moving in opposite directions with uniform speed of 30 m/s. one of them is blowing a whistle of frequency 540 Hz. Calculate the frequency heard by driver of second engine before they pass each other. speed of sound is 330 m/sec:
Answer: (4)
Solution
Before they pass, the two engines are *approaching* each other, so both Doppler effects raise the pitch. The observer moves towards the source, which adds to the effective wave speed, and the source moves towards the observer, which shortens the wavelength:
f =
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