1.

A person standing at a certain distance from a wall produces a loud sound. He hears the echo of the sound after 1.8s Calculate the distance between the wall and the observer if the velocity of sound in air is 340 m/s. (A) 612m (B) 306 m (C) 377.7m (D) 755.4m

Answer»

(B) 306 m

2d = v x t 

2 x d = 340 x 1.8

d = 340 x 18 / 2 x 10 = 306m



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