NEET-XII-Physics
13: Nuclei
- #17The fission properties of
are very similar to those of
.
The average energy released per fission is 180 MeV. How much energy, in MeV, is released if all the atoms in 1 kg of pure
undergo fission?
Ans : Average energy released per fission of
, 
Amount of pure
, m = 1 kg = 1000 g
NA= Avogadro number = 6.023 × 1023
Mass number of
= 239 g
1 mole of
contains NA atoms.
∴m g of
contains

∴Total energy released during the fission of 1 kg of
is calculated as:

Hence,
is released if all the atoms in 1 kg of pure
undergo fission.