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A source producing sound of frequency 17...

A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity `17 ms^(-1)`. The apparent change in the wavelength of sound heard by the observer is (speed of sound in air `= 340 ms^(-1)`)

A

0.1m

B

0.2m

C

0.4m

D

0.5m

Text Solution

Verified by Experts

The correct Answer is:
A
`lambda.=lambda((v-v_(S))/(v))`
`implies lambda.=((v-v_(S)))/(f)=((340-17))/(f)=(323)/(170)implieslambda.=1.9m`
Now, `lambda=(340)/(170)=2m`
`therefore lambda-lambda.=2-1.9=0.1m`
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