A) 11.5 s
B) 21 s
C) 3.75 s
D) 10 s
Correct Answer: A
Solution :
\[h=ut+\frac{1}{2}g\,{{t}^{2}}\] \[500=0\times t+\frac{1}{2}\times 10\,{{t}^{2}}\] \[5{{t}^{2}}=500\] \[t=10\,s\] \[\text{Time}=\frac{\text{Height}\,\text{of}\,\text{tower}}{\text{Velocity}\,\text{of}\,\text{sound}}\] \[=\frac{500}{330}=1.5\,s\] Hence the sound of splash will be \[={{l}_{0}}+1.3=11.5\,s\]
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