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

Question

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Answer 1

The energy equivalent of the particular mass is given as:
$E = m c^{2}$

mass is given as $= 0.5 g = 0.5 \times 1 0^{- 3} k g$
and the speed of light $(c) = 3 \times 1 0^{8} m / s$ ;.

So, $E = 0.5 \times 1 0^{- 3} \times (3 \times 1 0^{8})^{2}$

$E = 4.5 \times 1 0^{! 3} J$

Answer 2

The energy equivalent of the particular mass is given as:

E = m c^{2}

mass is given as

= 0.5 g = 0.5 \times 1 0^{- 3} k g

and the speed of light

(c) = 3 \times 1 0^{8} m / s

;.

So,

E = 0.5 \times 1 0^{- 3} \times (3 \times 1 0^{8})^{2}

E = 4.5 \times 1 0^{! 3} J