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A stretched wire of length 30 cm emits a...

A stretched wire of length 30 cm emits a note of freqency 200 Hz, when plucked at its centre, By keeping its tension constant, the length of the wire is decreases by 5 cm. then it will a sound note of frequency ?

A

160 Hz

B

180 Hz

C

210 Hz

D

240 Hz

Text Solution

Verified by Experts

The correct Answer is:
D
`n_(2)/n_(1) = l_(1)/l_(2) = 6/5 :. n_(2) = 6/5 xx 200 = 240 ` Hz
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MARVEL PUBLICATION-STATIONARY WAVES-MULTIPLE CHOICE QUESTIONS ( STANDARD LEVEL )
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