Question

A person rings a metallic bell near a strong
concrete wall. He hears the echo after
0.3 s. If the sound moves with a speed of
340 m/s. The wall is far from him?
(a) 102 m
(b) 11 m
(c) 51 m
(d) 30 m. please give explanation​

Answer 1

Answer:

2d=s×t

2d=0.3×340

2d=102

d=102/2

d=51 ANS...

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