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Across 4. particle which annihilates with the proton 5. the maximum range of the Strong Nuclear Force (in femtometres) 7. the lepton/antilepton which leaves alongside an electron in beta minus decay 8. "...." laws, must be obeyed in any interaction, and at any point in a F/Diag. 11. setting of an oscilloscope controlling the vertical (voltage) scale (mV/div) 12. quantity changing continuously up the page in a Feynman diagram 14. "greater/smaller"?- what happens to resistance of a thermistor getting colder 17. particle family, not fundamental, made of two other families 18. Name of wavelength possessed by particle with rest mass 19. minimum energy required for an electron to leave a metal surface 20. non-fundamental particle family, which has no baryon or lepton number 21. The unit for electric charge

Down 1. The ratio of charge over mass for a particle (2 Words) 2. What remains when an electron leaves a neutral atom 3. "..." number, Z, goes at the bottom in nuclear notation 6. ".... quark" : like a down quark, but with one difference 9. unit of energy which is 1.6x10^-19 Joules. (2 Words) 10. type of circuit arrangement where voltage is same across each component 13. Type of spectrum produced when light is shone through a cold gas 15. The particle in an atom with the highest Charge/Mass ratio 16. a conservation number possessed only by some particles containing quarks