defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Physics Waves Doppler effect

An observer is moving towards a stationary source of frequency 250 Hz with a velocity of 40 m/s. If the velocity of sound is 330 m/s, the apparent frequency heard by the observer will be:

1

320 Hz

2

300 Hz

3

280 Hz

4

None of these

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