Question

Suppose that a photoelectric experiment is conducted using two lasers, one tuned to 450 nm(blue)output and the other tuned to 560 nm (yellow) output. Both frequencies exceed the work function, Φ= 1.62 eV, of the metal. Assuming the number of photons delivered by each laser is the same, which light would generate more electrons? Which light would eject electrons with greater kinetic energy?

Answer 1

Answer: Both  laser  produce the same number of electrons.

The blue light produces electron with higher kinetic energy.

Explanation: Taking into account the energy conservation for the photoelectric  effect

we have :

Ek ( kinetic energy) = E Photon ( phonon energy)- Fi ( work function)

E Photon = 1240/wavelenght (nm)