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A travelling wave is partly reflected an...

A travelling wave is partly reflected and partly transmitted from a rigid boundary. Let `a_(i),a_(r)and a_(t)` be the amplitude of incident wave, reflected wave and transmitted wave and `I_(i),I_(r)and I_(t)` be the corresponding intensities. Then choose the correct alternatives.

A

`(I_(i))/(I_(r))=((a_(i))/(a_(r)))^(2)`

B

`(I_(i))/(I_(t))=((a_(i))/(a_(r)))^(2)`

C

`(I_(r))/(I_(t))=((a_(r))/(a_(t)))^(2)`

D

All the above

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The correct Answer is:
A
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