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Definitions

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Electron   show
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show Emission of electrons from the surface of a hot metal  
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Work Function   show
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show Electromagnetic radiation of extremely high frequency and short wavelength  
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Photoelectric Effect   show
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Photon   show
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Threshold Frequency   show
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show Positively charged nucleons, with the same size charge as the electron  
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show Electrically neutral nucleons, with slightly larger mass than protons  
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show Number of protons in the nucleus of an atom  
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Mass Number   show
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show Atoms of the same atomic number but different mass number  
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Radioactivity   show
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show The charging of a neutral atom or molecule when it loses or gains one or more electrons  
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Penetration   show
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show An unstable isotope of an element that decays spontaneously emitting radiation  
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Alpha Emission   show
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show The emission of an electron when a neutron decays into a proton  
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Gamma Emission   show
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Radioactive Activity   show
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show Time taken for half of the nuclei in a given sample of radioactive isotope to decay  
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Nuclear Fission   show
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Nuclear Fusion   show
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show Where at least one neutron is released during each fission reaction  
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Critical Mass   show
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Radiation   show
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show Radiation that comes from environmental sources including the Earth's crust, the atmosphere, cosmic rays and radioisotopes  
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Created by: conordesmond
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