MDCAT Physics MCQ #2582

Photoelectrons are stopped by 3 V potential. What formula gives photon frequency?

MDCAT Physics MCQ #2582

  1. Question 1

    Q1. Photoelectrons are stopped by 3 V potential. What formula gives photon frequency?

    • A) f = (eV + Φ)/h
    • B) f = (eV - Φ)/h
    • C) f = eV/h
    • D) f = Φ/h

    Answer: f = (eV + Φ)/h

    Explanation: Work function must be overcome first. Option B subtracts Φ instead.