Assume that a neutron breaks into a proton and an electron. The energy released during this process is (Mass of neutron = `1.6725 xx 10^(-27)` kg, mass of proton = `1.6725 xx 10^(-27)` kg, mass of electron = `9 xx 10^(-31)` kg)

Options

A. `0.73 MeV`
B. `7.10 MeV`
C. `6.30 MeV`
D. `5.4 MeV`

Answer

A

Explanation

`._(0)n^(1)rarr._(1)H^(1)+._(-1)e^(0)+overset(-)v+Q`
`Deltam+m_(n)-m_(alpha)=m_(e )`
`=(1.6725xx10^(-27)-1.6725xx10^(-27)-9xx10^(-31))kg`
`= -9xx10^(-31) kg`
Energy `=9xx10^(-31) kg`
`=0.511 MeV`
Which is nerarly equal to `0.73 MeV` but as energy will be required.
Since mass is increasing so answer `= -0.511 MeV`