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What is the photoelectric effect?
Emission of electrons from a metal surface when light of sufficient frequency falls on it
Who explained the photoelectric effect?
Albert Einstein — using the concept of photons — won Nobel Prize 1921
What is a photon?
A quantum of light energy — E = hf where h is Planck's constant (6.626×10⁻³⁴ Js)
What is work function?
Minimum energy needed to eject an electron from a metal surface
What is de Broglie's hypothesis?
Every moving particle has an associated wavelength — λ = h/mv
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