Two cars X and Y are approaching each other with velocities 36km/h and 72km/h respectively. The frequency of a whistle sound as emitted by a passenger in car X, heard by the passenger in car Y is 1320Hz. If the velocity of sound in air is 340m/s, the actual frequency of the whistle sound produced is …..Hz
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(1210)
Vx = 36 km/hr = 10 m/s
Vy = 72 km/hr = 20 m/s
by doppler's effect
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