# How Much is this Energy in Mev? (Speed of Light = 3 × 108 M/S) - Science

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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#### APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 3 Sources of Energy
Q 27.5 | Page 158

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