NEET-XII-Physics
13: Nuclei
- #27Consider the fission of
by fast neutrons. In one fission event, no neutrons are emitted and the final end products, after the beta decay of the primary fragments, are 
and
. Calculate Q for this fission process. The relevant atomic and particle masses are
m
=238.05079 u
m
=139.90543 u
m
= 98.90594 u
Ans : In the fission of, 10 β- particles decay from the parent nucleus. The nuclear reaction can be written as:
It is given that:
Mass of a nucleus
m1 = 238.05079 u
Mass of a nucleus
m2 = 139.90543 u
Mass of a nucleus, m3 = 98.90594 u
Mass of a neutron
m4 = 1.008665 u
Q-value of the above equation,
Where,
m’ = Represents the corresponding atomic masses of the nuclei
= m1 - 92me
= m2 - 58me
= m3 - 44me
= m4
Hence, the Q-value of the fission process is 231.007 MeV.