A) \[\text{5 }\!\!\times\!\!\text{ 1}\,\text{0}{{\text{.}}^{\text{-4}}}s\]
B) \[\text{4}\text{.5 }\!\!\times\!\!\text{ 1}\,{{\text{0}}^{\text{-3}}}s\]
C) \[\text{5 }\!\!\times\!\!\text{ 1}\,{{\text{0}}^{\text{-8}}}s\]
D) \[\text{4}\text{.5 }\!\!\times\!\!\text{ 1}\,{{\text{0}}^{\text{-6}}}s\]
Correct Answer: A
Solution :
Velocity of radiowave is \[3\times {{10}^{8}}m/s\] Timer \[=\frac{Distance}{time}\] \[=\frac{150\times 1000}{3\times {{10}^{8}}}\] \[=5\times {{10}^{-4}}s\]
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