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## QuestionPhysicsClass 12

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

The mass, $$m=1g=10^{-3}\mathit{kg}$$
The speed of light, $$c=3\times 10^8m/s$$
Find the Energy as follows:
$$E=mc^2$$
$$E=10^{-3}\times \left(3\times 10^8\right)^2J$$
$$E=9\times 10^{13}J$$
Hence, if one gram of matter is converted to energy, there will be a release of huge amount of energy.