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The wavelength of two sound waves are 49...

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

A

`6`

B

`10`

C

`14`

D

`18`

Text Solution

Verified by Experts

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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