Question

the work function of metal is 4.0 ev.if the metal is irradiated with radiation of wave length ,then themaximum kineticenergy of the photo electron would be about​

Answer 1

Answer:

K.E = 2.2 eV

Explanation:

Given

work function = 4.0 eV

K.E = ??

Solution

K.E = total energy - work function

total energy = hc/λ

total energy = 6.6 X 10⁻³⁴ X 3 X 10⁸ / 200 nm

total energy = 6.2 eV

K.E = total energy - work function

K.E = 6.2 - 4.0

K.E = 2.2 eV