A) 47 m
B) 34 m
C) 17 m
D) 9 m
Correct Answer: C
Solution :
Given : Velocity of sound in air \[\upsilon =340m/s\]Time for which the effect of sound remains on the human air is 1/10th of the second. Hence, the minimum distance for echo hearing sound is given by \[s=\frac{1}{2}\times \upsilon \times \Delta t=\frac{1}{2}\times 340\times \frac{1}{10}=17m\]
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