If a proton and anti-proton come close to each other and annihilate, how much energy will be released ?

Options

A. `1.5xx10^(-10) J`
B. `3xx10^(-10) J`
C. `4.5xx10^(-10) J`
D. `6xx10^(-10) J`

Answer

B

Explanation

Mass of proton = Mass of antiproton = 1amu
Total mass after annihilation = 2 a.m.u.
`therefore` Energy equivalent of 2 a.m.u.
`=2xx931 MeV = 2xx931xx10^6 eV`
`=2xx931xx10^6xx1.6xx10^(-19) J = 931 xx 3.2xx10^(-13) J`
`=2.979xx10^(-10) J = 3xx10^(-10) J`