The work function of a metal is 5 eV. What is the kinetic energy of the photoelectron ejected from the metal surface if the energy of the incident radiation is 6.2 eV?

Options

A. a) `6.626 xx 10 ^(-19) J`
B. b)`8.10 xx 10 ^(-19) J`
C. c`1.92 xx 1 0^(-19)J`
D. d)`8.01 xx 10 ^(-18) J`

Answer

D

Explanation

Work function `(W)= hv _(0) = 5 eV`
Energy of incident radiation,
`hv = 6.2 eV`
Kinetic energy of phtoelectron
`= hv - W`
`= 6.2 - 5`
`=1.2 e V`
`= 1.2 xx 1.6 xx 10 ^(-19) J`
`=1.92 xx 10 ^(-19) J`