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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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This solution provides assistance with the questions on work function and KE of ejected electrons.

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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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