Questions on work function and KE of ejected electrons
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Light of wavelength 1900 A is incident on a nickel surface (work function 4.9 eV)
a) calculate the stopping potential
b) what is the cutoff frequency for nickel?
c) what is the threshold wavelength ?
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Incident photons have wavelength Lamda; as
Lamda = 1900 A = 1900 x 10^-10 m
Frequency of incoming photons f is given by
f = c/Lamda = 3 x 10^8/1900 x 10^-10
f = 1.579 x 10^15 Hz
Maximum Kinetic energy of ejected electron from surface (KEe) is given by
KEe = hf - W
Where hf is energy of incoming photon, h is plancks constant and W is ...
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