Wave Particle Duality - The idea that light can act both like a wave and like a particle without contradiction , Photoemission - The emission of photoelectrons from the surface of a material in the photoelectric effect , Photon - A particle of light that can also be thought of as a short burst of wave energy, Light - An electromagnetic wave that travels at 3x108 ms-1. It reflects, refracts and diffracts, Photoelectron - An electron emitted from the surface of a material due to a photon incident on the material. , Electroscope - Consists of a metal plate, metal rod and gold leaf. The deflection of the gold leaf can be used to investigate the photoelectric effect. ,

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