OCR A2 Physics Definitions 4.0 / 5 based on 1 rating ? PhysicsA2/A-levelOCR Created by: Lucyl57Created on: 07-06-13 16:16 81012356749 Across 1. the charge stored per unit potential difference. Its unit is the farad (F). (11) 4. The number of protons in the nucleus (6, 6, 1) 5. The power per unit cross-sectional area. (9) 6. One farad is one coulomb per volt. (5) 9. The speed of the recession of a galaxy is directly proportional to its distance from the Earth. (7, 3) 10. Activity of the source divided by the number of nuclei present. (3, 5, 8) Down 2. The rate at which a source emits radioactive particles (8, 1) 3. One tesla is the magnetic field strength when a wire of length one metre and carrying a current of one ampere at a right angle to the field experiences a force of one newton (5) 7. One weber is the magnetic flux when a magnetic field of magnetic flux density of one tesla passes at right angels through an area of one square metre. (5) 8. The average density of the universe above which the universe will collapse and below which the universe will expand forever. (8, 7)
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