In a thermo-nuclear reaction, 10−3kg of hydrogen is converted into 0.99×10−3kg of helium. If the efficiency of the generator is 50% then the electrical energy generated in kWh is-
A
1.3×105
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B
1.25×105
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C
1.5×105
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D
105
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Solution
The correct option is B1.25×105 The efficiency of the reactor is,
η=EoutEin
Eout=ηEin
Eout=ηΔmc2
Substituting the data given,
Eout=50100×(1−0.99)×10−3×9×1016
=12×0.01×10−3×9×1016
=4.5×1011J
=45×101036×105kWh
=1.25×105kWh
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Hence, (B) is the correct answer.