A) \[2\times {{10}^{-8}}\] sec
B) \[2\times {{10}^{8}}\] sec
C) \[2\times {{10}^{-11}}\] sec
D) \[2\times {{10}^{11}}\] sec
Correct Answer: C
Solution :
Velocity of light in the window = \[\frac{3\times {{10}^{8}}}{1.5}m{{s}^{-1}}\]\[=2\times {{10}^{8}}m{{s}^{-1}}\] Hence \[t\] = \[\frac{4\times {{10}^{-3}}}{2\times {{10}^{8}}}s=2\times {{10}^{-11}}s\]
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