A boy standing 70m from a high wall claps his hands. After how much time is an echo heard? (The speed of sound in air is\[\text{35}0\text{ m}{{\text{s}}^{-\text{1}}}\])

A boy standing 70m from a high wall claps his hands. After how much ti

1.	A boy standing 70m from a high wall claps his hands. After how much time is an echo heard? (The speed of sound in air is\[\text{35}0\text{ m}{{\text{s}}^{-\text{1}}}\])
A.	4 s
B.	0.4 s
C.	104 s
D.	1.2 s
Answer» C. 104 s

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A boy standing 70m from a high wall claps his hands. After how much time is an echo heard? (The speed of sound in air is\[\text{35}0\text{ m}{{\text{s}}^{-\text{1}}}\])

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