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| The fundamental "size" unit; the smallest amount of anything. One quantum of light energy is called a photon. |
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| In the particle model of electromagnetic radiation, a particle that travels only at the speed of light and whose energy is related to the frequency of the radiation in the wave model. |
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| A fundamental constant of quantum theory that determines the scale of the small-scale world. Planck's constant (symbol h) multiplied by the frequency of radiation gives the energy of a photon of that radiation. |
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| The ejection of electrons from certain metals when eposed to certain frequencies of light. |
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| The branch of physics that is the study of the motion of particles in the micro world of atoms and nuclei. |
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| The branch of physics that is the general study of the micro world of photons, atoms, and nuclei. |
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