A) \[15.30\,\,s\]
B) \[14.47\,\,s\]
C) \[12.20\,\,s\]
D) \[11.13\,\,s\]
Correct Answer: B
Solution :
The total distance travelled by the sonar beam is\[11\times 2=22\,\,km\]. The speed of the wave is \[T=\frac{\lambda }{\upsilon }=\frac{22\times {{10}^{3}}m}{1520\,\,m\,\,{{s}^{-1}}}=14.47\,\,s\]
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