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A toy car blowing its horn is moving with a steady speed of 5 m...

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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 is close to 1 340 Hz 2 510 Hz 3 170 Hz 4 680 Hz

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