Q123 / 180 · NEET 2020 (Phase 1) · Physics

The energy equivalent of $0.5 g$ of a substance is:

Correct answer
A
$4.5 \times 10^{13} J$
B
$1.5 \times 10^{13} J$
C
$0.5 \times 10^{13} J$
D
$4.5 \times 10^{16} J$

Solution

Einstein's theory of special relativity gives the relation between mass and energy.

Energy, $E = m c^{2}$ , where $c$ is the speed of light.

$E = 0.5 \times 10^{- 3} \times 9 \times 10^{16}$

$\Rightarrow E = 4.5 \times 10^{13} J$

Hence, the correct answer is option: 'A'.

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