Question

The work function (Φ) of a photoelectricmaterial is the energy that a
photon of light must possess to just expel an electron from thesurface of
the material. The corresponding frequency of the light is thethreshold
frequency (νth) and Φ = h νth. The higher the energy of theincident
radiation, the more kinetic energy that ejected electrons have inmoving
away from the surface. The work function for cesium is 3.42 X10-19J.

1. What is the threshold frequency for the photoelectric effectfor
cesium.
2. Will 1000 nm infrared radiation produce the photoelectric effecton
cesium? Explain and show calculations.
3. A 425-nm blue light shines on a piece of cesium. Will thisradiation
produce a photoelectric effect? Show calculations as in B.

Please help by showing the calculations in asmuch detail as possible. The question may seem redundant but iappreciate the help. Thank you.