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In a hall, a person receives direct soun...

In a hall, a person receives direct sound waves from a source `120 m` away. He also receives waves from the same source which reach him after being reflected from the `25 m` high ceiling at a point halfway between them. The two waves interfere constructively for wavelengths (in metres)

A

`20,20/3,20/3 , ` etc.

B

10,5,2.5 etc

C

10,20 ,30 , etc

D

15,25,35 etc

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The correct Answer is:
A
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