In a large room, a person receives direct sound waves from a source 120 m away from him. He also receives waves from the same source which reach him, being reflected from the 25 metre high ceiling at

Question

In a large room, a person receives direct sound waves from a source 120 m 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 constructively for wavelength of:

TestHub · Accepted Answer

Reflected path = 2 6 0 2 + 2 5 2 ​ = 2 × 65 = 130 m. Path difference = 10 m. Constructive interference needs 10 = nλ , so λ = 10 , 5 , 10/3 , 2.5 , … (taking no phase change on reflection).

Physics - Sound Wave Question with Solution | TestHub

Options:

Doubts & Discussion