A person rings a metallic bell near a strong concrete wall. He hears t – McqOptions

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1.	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
Answer» D. 30 m

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