The velocities of sound in air and water are 336 m / s and

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The velocities of sound in air and water are 336 m / s and 1470 m/s respectively. Two sources producing waves of wavelength 6 m and 7 m sounded togather will produce beats

1. That can be heard in both the media
2. That can be heard only in water and not in air
3. That can be heard only in air and not in water
4. That can not be heard in either media

Correct Option: C

NA