Question

if an electron and a positron annihilitate , them the energy relasesed is
A. `3.2xx10^(-13)J`
B. `1.6xx10^(-13)J`
C. `4.8xx10^(-13)J`
D. `6.4x10^(-13)J`

Answer 1

Correct Answer - b
Mass of electron = Mass of position `=9.1xx10^(-31)kg`
According to positron annihilation,
`""_(+)beta^(0)+""_(-)beta^(0)tohv+hv`
Energy released, `E=(2m).c^(2)`
`=2xx9.1xx10^(-31)xx(3xx10^(8))=1.6xx10^(-13)J`