First slide

Mass Energy equivalence

Question

The energy equivalent of 0.5g of a substance is

Moderate

Solution

$\begin{array}{l} E = {mc}^{2} \\ E = 0 .5 \times 10^{- 3} \times {(3 \times 10^{8})}^{2} = 4 .5 \times 10^{13} J \end{array}$

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