Question

If a monochromatic light beam with quantum energy value of 2.9 eV incident upon a photocell where the work function of the target metal is 1.8 eV, what is the maximum kinetic energy of ejected electrons?

Answer 1

Answer:1.1 eV

Step-by-step explanation:

Given

Energy(E)=2.9 eV

Work function of the target=1.8 eV

We know that

`Energy(E)=W_0+KE_(max)`

Where
`W_0=work\ function`

`2.9=1.8+KE_(max)`

`KE_(max)=2.9-1.8=1.1 eV`