Question

 How much is this energy in MeV? (Speed of light = 3 × 10⁸ m/s)

Answer 1

The energy released in joules when 5 g (5/1000 kg ) of a material is completely converted into energy during a nuclear reaction is given by Einstein's equation as
` E=mc^2`
`=(5/1000)xx(3xx10^8)^2` 

`=4.5xx10^14j ` 
(e) The energy in MeV is given by:
`1/(1.6xx10^-13)xx4.5xx10^-13j` 

`(since 1meV=1.6xx10^-13j ) ` 

`=28xx10^27meV`