Posted by Jasmine on Monday, December 12, 2011 at 11:02pm.
To determine the work function of a material of a photodiode, you measuered the maximum Knetic energy of .5 eV correwsponding to a certain wavelength. Later on, you cut down the wavelength by 50% and found the maximum kinetic energy of the photoelectrons to be 3.8eV. From this information determine
a) work function of the material, and
b) the original wavelength.

Physics  drwls, Tuesday, December 13, 2011 at 2:04am
E1(max) = 0.5 eV = hc/L1  phi
E2(max) = 3.8 eV = 2hc/L1  phi
where
L1 = first wavelength
L1/2 = second wavelength
phi = work function
3.3 eV = hc/L1
b) Solve for L1 first
a) Then solve for phi