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A toy-car, blowing its horn, is moving w...

A toy-car, blowing its horn, is moving with a steady speed of 5 m//s, away from a wall. An observer, towards whom the toy car is moving, is able to heat 5 beats per second. If the velocity of sound in air is 340 m/s, the frequency of the horn of the toy car is close to :

A

170 Hz

B

680 Hz

C

340 Hz

D

510 Hz

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