AQA A2 Physics A Nuclear Physics Definitions

1. The mass of one mole of a substance. (5, 4)
4. The number of nuclei of the isotope that disintegrate per second. Measured in becquerels (Bq) (8)
5. Atoms of the same element which have the same number of protons but a different number of neutrons. (8)
7. The fusing together of light nuclei to form a heavier nucleus (6)
8. For a fixed mass of gas at a constant temperature, its pressure x its volume is constant (6, 3)
10. The unified atomic mass constant, 1/12th of the mass of an atom of carbon-12 isotope. (6, 4, 4)

2. A fluid used to prevent a machine or device from becoming dangerously hot. (7)
3. The minimum mass of the fissile isotope in a nuclear reactor necessary to produce a chain reaction. (8, 4)
6. A gas under conditions such that it obeys Boyle's Law (5, 3)
9. The probability of an individual nucleus decaying per second (5, 8)

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