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Sahay Sir > Question Answers > MTG NEET Physics > Part 1 > Chapter 17 - Wave Motion > A source of sound of sound is approaching an observer with speed of 30 ms^−1 and the observer is approaching the source with a speed of 60 ms^−1 . Then the fractional change in the frequency of sound (speed of sound in air = 330 ms^−1) is

A source of sound of sound is approaching an observer with speed of 30 ms^−1 and the observer is approaching the source with a speed of 60 ms^−1 . Then the fractional change in the frequency of sound (speed of sound in air = 330 ms^−1) is

A car moving with velocity 50 m s towards a wall sounds a horn of frequency of 1.2 kHz. The velocity of sound is 350 m/s the apparent frequency of the echo heard by the driver is