Quantum Physics. Quantum physics is a discipline that attempts to explain the behavior of matter at the atom level.
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1) If the incident light falls below a cutoff frequency (fc) no electrons are emitted.
2)The maximum kinetic energy of the photoelectrons is independent of the light intensity
3)The maximum kinetic energy increases with increase in light frequency
4) Electrons are emitted almost instantly after the surface is illuminated.
1’) The energy of a photon must be at least equal to the work function explaining cutoff
2’) KE max depends on frequency so intensity is immaterial
3’) KEmax is linear with frequency so KE increases with increase in frequency.
4’)Electrons are emitted instantly because light energy is in packages rather than waves.
Δλ = λ – λo = (h/mec)(1-cosθ)
where me = mass of the electron
θ = the angle between the scattered and incident photons
h/mec = Compton wavelength = 0.00243nm