Calculate and compare the energy realesed by (a) fusion of 1.0 kg of hydrogen deep within Sun and (b) the fission of 1.0 kg of `""^(235)U` in a fission reactor.

Explanation

1g of `""_(1)^(1)H` contain Avogadro.s number
`:. 1kg ` of `""_(1)^(1)H` contains `6.023 xx 10^(23) xx 10^3`
`4 ""_(1)^(1)H` is required for a reaction, hence
`epsilon_1= (6.023 xx 10^23 xx 10^3 xx 26)/(4) = 39 xx 10^(26) MeV`
For uranium, `epsilon_2 = (6.023 xx 10^(23) xx 10^3 xx 200)/(0.235) = 5.1 xx 10^(26) MeV`
`epsilon_1` is nearly 8 times `epsilon_2`.