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

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