Photons are particles of light that carry energy and have zero mass. They behave both as particles and waves, and their energy is directly proportional to their frequency.
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Photo-electrons: When photons strike certain materials, they can knock out electrons from the material's surface. These ejected electrons are called photo-electrons.
Einstein relationship: The Einstein relationship states that the energy (E) of a photon is equal to Planck's constant (h) multiplied by its frequency (f), expressed as E = hf.
This term refers to the concept that particles like photons can exhibit both wave-like and particle-like behavior depending on how they are observed or interacted with.