In a photoelectric experiment, the collector plate is at 2.0 V with respect to the emitter plate made of coper ( ϕ = 4.5 eV). The emitter is wavelength 200 nm. Find the minimum and maximum kinetic energy of the photoelectrons reaching the collector.

Question

Philoid · Accepted Answer

Given, stopping potential =2V

Work function Ф =4.5eV

Wavelength λ=200nm

∴ From Einstein’s photoelectric equation

∴ Minimum kinetic energy of photoelectron is 1.7eV

And maximum kinetic energy

[∵ Electric potential of 2V is applied for the electrons to

accelerate ∴ it is (2+1.7)]

In a photoelectric experiment, the collector plate is at 2.0 V with respect to the emitter plate made of coper (ϕ = 4.5 eV). The emitter is wavelength 200 nm. Find the minimum and maximum kinetic energy of the photoelectrons reaching the collector.