A) 25 kWh
B) \[9\times {{10}^{10}}kWh\]
C) \[3\times {{10}^{10}}kWh\]
D) \[0.5\times {{10}^{5}}kWh\]
Correct Answer: A
Solution :
According to Einstein's mass energy equivalence relation \[E=m{{c}^{2}}\] \[={{10}^{-6}}\times {{10}^{-3}}\times {{(3\times {{10}^{8}})}^{2}}J\] \[=9\times {{10}^{7}}\,J\] \[=\frac{9\times {{10}^{7}}}{3.6\times {{10}^{6}}}\,kWh\] \[(\because \,\,1\,kWh=3.6\times {{10}^{6}}\,J)\] \[=25\,\,kWh\]
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