A person rings a metallic bell near a strong concrete wall He hears the echo after 0 3 s if the...........

General Science (CDS) Physics

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, how far is the wall from him?

102 m

11 m

51 m

30 m

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Explanation:

Let the distance is x metre. Distance = Velocity × Time x = 340 × 0.3 = 102 metre (This is the total distance) \ The distance of wall is 102 2 = 51 metre.