Occurs when light shining onto a piece of metal causes electrons to be given off. For most metals UV light is required.
Atomic line spectra
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The light given out by low-pressure gases when they are exited by heat or electrical discharge. An example of this is given out by neon advertising lights or yellow sodium vapour street lights.
Nuclear reactions
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In nuclear reactions the atomic number and the mass number are conserved.
Binding energy
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The amount of energy which must be supplied in order to make up the mass deficit.
Nuclear fission
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Occurs when a large nucleus split into smaller nuclei. When this happens, a large amount of energy is released as KE and gamma radiation.
Nuclear fusion
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This is where 2 small nuclei join together to form a larger nucleus. Again large amounts of energy is released.