alleryPhotoelectric effect: when light of frequency ν falls on a metal of work function φ, KE of emitted electrons is:
AKE = hν - φ (if hν > φ, otherwise no emission)
BKE = φ
CKE = hν
DKE = hν + φ
Answer & Solution
Correct answer: A. KE = hν - φ (if hν > φ, otherwise no emission)
**Einstein's photoelectric equation:** KE_max = hν - φ.
Photon energy hν first overcomes the work function φ
remainder becomes kinetic energy.
No emission if hν < φ (regardless of intensity).
Earned Einstein the 1921 Nobel Prize.
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