If mass of `U^(235)=235.12142 a.m.u.`, mass of `U^(236) =236.1205 amu`, and mass of neutron `=1.008665 am u`, then the energy required to remove one neutron from the nucleus of `U^(236)` is nearly about.

Options

A. 75 MeV
B. 6.5 MeV
C. 1 eV
D. zero

Answer

B

Explanation

(b) Mass of one atom of `U^235`
`=235.121420` amu
Mass of one neutron `=1.008665` amu
Sum of the masses of `U^235` and neutron
=`236.130085 = 236.130` amu
Mass of one atom of `U^236`
=`236.123050`amu
=`236.123` amu
Increase in mass when one neutron is removed from
`U^236 = 236.136 - 236-123`
`=0.007` amu
`:.` Energy required to remove one neutron
=`0.007 xx 931 MeV`
=`6.517 MeV = 6.5 MeV`.