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As speed limit is 120 km/h but speed of ...

As speed limit is `120 km/h` but speed of the car is less than it so that policeman does not punishing the car driver. Two sound notes have wavelengths `83/ 170 m` and `83/ 172 m` in the air.These noteswhen sounded together produce 8 beats per second.Calculate the velocity of sound in the air and frequencies of the two notes.

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