The work function of a metal is `2.5eV`. A monochromatic ligth of wavelength `300 Å` falls on it

Options

A. The maximum kinetic energy of ejected electron is `1.64eV` approximately
B. The minimum kinetic energy of ejected electron is zero
C. The stopping potential is `1.64V` approximately
D. Electrons can not be ejected

Answer

A, B, C

Explanation

`KE_(max)=(hc)/lambda-phi`
=`{((4.14xx10^(15))xx(3xx10^(8)))/(3000xx10^(-10))-2.5}eV`
`1.64eV,K.E._(min)=zero`
Stopping potential =`1/e((hc)/lambda-phi)=1.64V`