An echo of the sound produced can be heard only if it reaches our ear – McqOptions

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1.	An echo of the sound produced can be heard only if it reaches our ear after
A.	\[\frac{1}{15}\]th of a second
B.	\[\frac{1}{13}\]th of a second
C.	\[\frac{1}{10}\]th of a second
D.	\[\frac{1}{5}\]th of a second
Answer» D. \[\frac{1}{5}\]th of a second

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