The wavelength of two sound waves are 49...

The wavelength of two sound waves are `49cm` and `50cm` respectively. If the room temperature is `30^(@)C` then the number of beats produced by them is approximentely (velocity of sound in air at `0^(0)C = 332 m//s`).

`6`

`10`

`14`

`18`

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The correct Answer is:

A, D

`v = 332sqrt((303)/(273)) rArr` Beat frequency `= f_(1) - f_(2) = v((1)/(lambda_(1)) - (1)/(lambda_(2)))`
`= 332 sqrt((303)/(273))((1)/(49) - (1)/(50)) xx 100 = 14`

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