1. 4.5×10¹⁶ J 2. 4.5×10¹³ J 3. 1.5×10¹³ J 4. 0.5×10¹³ J

Answer: 2. 4.5×10¹³ J Use Einstein's mass-energy relation E=mc² . E=0.5×10⁻³×(3×10⁸)²=4.5×10¹³\ J Answer: option 2. Remember to convert grams to kilograms.

Topic: Mass-energy relation, mass defect, binding energy per nucleon· Atoms and Nuclei

The energy equivalent of 0.5 g of a substance is :

1. $4.5\times10^{16}$ J

2. $4.5\times10^{13}$ J

3. $1.5\times10^{13}$ J

4. $0.5\times10^{13}$ J

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 2. $4.5\times10^{13}$ J

Use Einstein's mass-energy relation $E=mc^2$.

$$E=0.5\times10^{-3}\times(3\times10^8)^2=4.5\times10^{13}\ \text{J}$$

Answer: option 2. Remember to convert grams to kilograms.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The energy equivalent of 0.5 g of a substance is :

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