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In a large room , a person receives dire...

In a large room , a person receives direct sound waves from a source 120 metres away from him. He also receives waves from the same source which reach , being reflected from the `25 m` high ceiling at a point halfway between them . The two waves interfere constructively for a wavelength of

A

20, 20/3, 20/5, etc.

B

10 ,5 ,`2.5`, etc.

C

10 , 20, 30, etc.

D

15, 20, 35, etc.

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The correct Answer is:
A
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