The driver of a car travelling with speed 30 m/s towards a hill sound a horn of frequency 600 hz. if the velocity of sound in air is 30 m/s, the frequency of reflected sound as heard by driver is
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Since both the source and observor are moving towards each other, the formula shd be frequency(V+Vo/V-Vs)
=600(330+30/330-30)
=600(360/300)
=720Hz
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