The mass defect in a particular nuclear reaction is 0.3 g. The amount of energy liberated, in kWh is (velocity of light = `3 xx 10^(8) ms^(-1)`.

Options

A. `1.5 xx 10^(6)`
B. `2.5 xx 10^(6)`
C. `3 xx 10^(6)`
D. `7.5 xx 10^(6)`

Answer

D

Explanation

From Einstein's Mass Energy equivalence,
`E= mc^(2)`
m = 0.3 g
`E = 0.3 xx 10^(-3) xx (3 xx 10^(8))^(2) ` =`2.7xx 10^(13)`
`E = 7.5 xx 10^(6)kWh`.