# Physics -

The work function of cesium surface is 2.0eV
(a)find the maximum kinetic energy of the ejected electrons when the surface is illuminated by violet light with wavelenght = 4.13 x 10^3 Angstroom unit
h = 6.63 x 10^9-34)Js

(b) what is the threshold wavelenght ( the largest wavelenght) for the photoelectric effect to occur with this metal?

maximumKE= photonenergy - work function

Threshold energy= work function
Threshold freq= thresholdenergy/planck's

wavelength*frequency= speedlight
calculate wavelength.

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