A boy stands facing a high wall at a distance of \[85\,\,m\] from it and then blows a whistle. Calculate the time interval when he hears an echo. (Speed of sound\[=340\,\,m\,\,{{s}^{-1}}\]).

A boy stands facing a high wall at a distance of \[85\,\,m\] from it a

1.	A boy stands facing a high wall at a distance of \[85\,\,m\] from it and then blows a whistle. Calculate the time interval when he hears an echo. (Speed of sound\[=340\,\,m\,\,{{s}^{-1}}\]).
A.	\[1\,\,s\]
B.	\[2\,\,s\]
C.	\[0.5\,\,s\]
D.	\[3\,\,s\]
Answer» D. \[3\,\,s\]

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A boy stands facing a high wall at a distance of \[85\,\,m\] from it and then blows a whistle. Calculate the time interval when he hears an echo. (Speed of sound\[=340\,\,m\,\,{{s}^{-1}}\]).

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