STANDARDPhysics-Energy and Power
STANDARD Physics Mass-Energy Equivalence MCQ Question
Type: MCQ-numerical-Medium-Class 11
How much mass has to be converted into energy to produce electric power of 500 MW for one hour?
A
2 × 10⁻⁵ kg
B
1 × 10⁻⁵ kg
C
3 × 10⁻⁵ kg
D
4 × 10⁻⁵ kg
Correct Answer
Option A
Detailed Explanation
Using E = mc², the energy produced is E = P × t = 5 × 10⁸ × 3600 = 18 × 10¹¹ J. Solving for mass, m = E/c² = 18 × 10¹¹ / (9 × 10¹⁶) = 2 × 10⁻⁵ kg.
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