If the sound moves with a speed of 340 m/s :

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?
(a) 102 m
(b) 11 m
(c) 51 m
(d) 30 m

Anurag Mishra Professor Asked on 15th February 2016 in Physics.
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    Answer: (c) 51 m 

    Anurag Mishra Professor Answered on 16th February 2016.
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