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Q.

Calculate the energy equivalent of $1 g of a substance$ .

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a

9 \times 10^{13} J

b

9 \times 10^{14} J

c

9 \times 10^{16} J

d

9 \times 10^{12} J

answer is A.

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Detailed Solution

Energy equivalent of 1g of a substance is

9 \times 10^{13} J

E = m c^{2}

Where,

m = mass

C = speed of light

E = Energy

E = 10^{- 3} \times (3 \times 10^{8})^{2} J

E = 9 \times 10^{13} J

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