This effect demonstrates the particle nature of light, and its explanation earned Einstein his Nobel.
Millikan obtained an accurate value of Planck's constant in the course of experiments investigating this effect, first observed by Heinrich Hertz. It occurs when the energy of incident light is greater than a characteristic work function. This effect demonstrates the particle nature of light, and its explanation earned Einstein his Nobel. For 10 points—name this effect in which photons knock electrons loose from a metal.
Millikan obtained an accurate value of Planck's constant in the course of experiments investigating this effect, first observed by Heinrich Hertz.
{photoelectric} effect