Colby College Photoelectric Effect ½ m υ 2 > eV electron can get through V= stopping potential 1. Current flows only if light has greater than a minimum frequency, ν ο . 2. Current is finite and instantaneous even if light intensity is small. 3. Kinetic energy of ejected electrons is not a function of the intensity. 4. Current is proportional to intensity = (amplitude) 2 . Conclusion: E photon = h ν = ½ m υ 2 + e Γ = ½ m υ 2 + Φ h = 6.626x10-34 J s h-= h/2 π = 1.055 x 10-34 J s ν = frequency m e = mass electron = 9.1093897x10-31 kg υ = speed e = charge on electron = 1.60217733x10-19 C Φ = work function = ionization potential of a metal atom in the solid
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