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Sound waves of frequency 660 Hz fall nor...

Sound waves of frequency `660 Hz` fall normally on a perfectly reflecting wall. The shortest distance from the wall at which the air particles have maximum amplitude of vibration is ……………… meters.

A

`(7)/(8)m`

B

`(3)/(8)m`

C

`(1)/(8)m`

D

`(1)/(4)m`

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The correct Answer is:
C
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