The Photoelectric Effect (Grade 12 NSC Matric Physical Sciences): Flashcards

Electrons emitted when light shines on substance

Minimum energy to knock electron out of metal

$W_0$ (in joules)

Min. frequency needed to emit electrons from metal

$E_{k_{max}} = hf - W_0$

Quanta (now called photons)

$h = 6.63 \times 10^{-34}$ J·s

None; only frequency affects kinetic energy

$1.6 \times 10^{-19}$ J

None; emission is instantaneous