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