Teaching HTET TGT Level 2 - 2024 Mock Test Physics Waves Doppler effect

An observer moves towards a stationary source of sound of frequency f. The apparent frequency heard by the observer is 2f. If the velocity of sound in air is 335 m/s, then the velocity of the observer is:

1

83 m/s

2

670 m/s

3

167.5 m/s

4

335 m/s

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