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Two sound waves (expressed in CGS units)...

Two sound waves (expressed in CGS units) given by ` y_(1)=0.3 sin (2 pi)/(lambda)(vt-x) and y_(2)=0.4 sin (2 pi)/(lambda)(vt-x+ theta)` interfere. The resultant amplitude at a place where phase difference is ` pi //2 ` will be

A

`0.7 cm`

B

`0.1 cm`

C

`0.5 cm`

D

None

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The correct Answer is:
B
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