Question

A proton is released from rest at a distance of 10^-4 A from the nucleus of a mercury atom (Z=80). The kinetic

energy of the proton when it is far away from the nucleus isA ​

Answer 1

Answer:

Mass of proton m=1.67×10−27  kg and charge =e=1.6×10−19C

Magnitude of electric field due to charge sheet is E=2ϵ0σ=2×8.85×10−122.21×10−9=124.86N/C

Force on proton due to charge sheet is F=eE=1.6×10−19×124.86

or ma=F=1.6×10−19×124.86

or a=1.67×10−271.6×10−19×124.86=1.2×1010m/s2

Using, S=ut+21at2,

here, u=0 so,  S=21at2

or t=a2S=1.2×10