A) \[3.20\,\,s\]
B) \[2.94\,\,s\]
C) \[5.94\,\,s\]
D) \[3.10\,\,s\]
Correct Answer: B
Solution :
\[f=1000\,\,Hz,\,\,\lambda =34\,\,cm=\frac{34}{100}m\] Wave speed \[\upsilon =f\,\,\lambda =100\times \frac{34}{100}=340\,\,m\,\,{{s}^{-1}}\] The time taken by the wave to travel \[1\,\,km\] is: \[t=\frac{d}{v}=\frac{1\,\,km}{340\,\,m\,\,{{s}^{-1}}}=\frac{1000\,\,m}{340\,\,m\,\,{{s}^{-1}}}=2.94\,\,s\]
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