Practice portal › Dual Nature of Matter and Radiation › Conceptual and Statement Questions on the Photoelectric Effect
Asked in AIPMT 2000 · Conceptual points of the photoelectric effect
Einstein's 1905 explanation of the photoelectric effect took Planck's quantum hypothesis and applied it to light itself.
He proposed that light travels as discrete quanta, each carrying energy E=h u fixed by the frequency alone.
That single assumption explains the threshold frequency, the independence of the electron energy from intensity, and the immediate start of emission.
The experimental confirmation of Kₘₐₓ=h u-φ₀ therefore established E=h u for light.
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