Calculate the electric potential at the surface of a gold nucleus of diameter 13 fermi. Atomic no. of gold is 79.

Explanation

Data supplied
Atomic no. of gold Z=79
Charge, `q=Ze=79 xx1.6 xx 10^(-19)C`
radius, r=6.5cm fermi `=6.5 xx 10^(-15)m`
Potential, `V=(1)/(4pi epsi_(0)). q/r=(9 xx 10^(9) xx 79 xx 1.6 xx 10^(-19))/(6.5 xx 10^(-15)m)-1.75 xx 10^(7)V="17.5 Mega volt"`