Question

S₁ and S₂ are two coherent sources of sound of frequency 110Hz each. They have no initial phase difference. The intensity at a point P due to S₁ is 0 and due to S₂ is 4I₀ . If the velocity of sound is 330 m/s then the resultant intensity at P is

(A) I₀ 

 (B) 9I₀ 

 (C) 3I₀ 

 (D) 8I₀  

Answer 1

Correct option (C) 3I₀    

Explanation:

The wavelength of sound source = 330/110 = 3 metre. The phase difference betwen interfering waves at P is