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JEE Main 10 April 2016 Paper

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Question : 11

Total: 90

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 hear 5 beats per second.If the velocity of sound in air is 340 m/s,the frequency of the horn of the toy car isclose to :

680 Hz
510 Hz
340 Hz
170 Hz

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