6)
Here the energy equivalent of mass m is related by the above equation
and c is the velocity of light in vacuum and is approximately equal to
3×108 m s–1 Example 13 2 Calculate the energy equivalent of 1 g of substance Solution
Energy, E = 10–3  × ( 3 × 108)2 J
     E = 10–3 × 9 × 1016 = 9 × 1013 J
Thus, if one gram of matter is converted to energy, there is a release
of enormous amount of energy