Question

A sound was produced. Three seconds later, its echo was heard. 

(a) What is the distance between the reflecting surface and source? (Speed of sound in air is 340 m/s) 

(b) Write TWO methods, by which you can reduce the harmful effects of reflection of sound in big halls.

Answer 1

(a) Distance = Velocity × time 

= 340 × 3 = 1020m 

So distance between the source and reflecting 

surface = 1020/2 = 510 m 

(b) Make the walls rough, provide a large number of ventilators.