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Einstein's photoelectric equation:

AKE_max = hν
BKE_max = hν - φ
CKE_max = hν × φ
DKE_max = φ - hν
Answer & Solution
Correct answer: B. KE_max = hν - φ
KE_max = hν - φ. Photon energy first overcomes work function φ remainder goes to electron's kinetic energy. No emission if hν < φ. Linear in frequency.
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