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The energy equivalent of 0.5 g of a substance is:

1. 4.5 × 10^13 J
2. 1.5 × 10^13 J
3. 0.5 × 10^13 J
4. 4.5 × 10^16 J

Correct answer: 4.5 × 10^13 J

Solution

Using Einstein's mass-energy equivalence formula, E = mc², where m = 0.5 g = 0.5 × 10⁻³ kg and c = 3 × 10⁸ m/s. Substituting, E = (0.5 × 10⁻³) × (3 × 10⁸)² = 4.5 × 10¹³ J.

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