A) 0.5s
B) 5s
C) 1.5s
D) 2s
Correct Answer: A
Solution :
Distance between the wall and the boy i.e.,\[d=85\text{ }m\] speed of sound (v) = 340 m/s time, (t) = ? We know, \[v=\frac{2d}{t}\] \[\Rightarrow \] \[340=\frac{2\times 85}{t}\] \[\Rightarrow \] \[t=\frac{2\times 85}{340}=0.5\,s\]You need to login to perform this action.
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