Higher Physics

3. matter we cannot see. The existence is supported by the orbital speed of stars in galaxies (4,6)
8. the number of coulombs of charge stored per volt
12. the first lepton discussed in physics
13. accounts for three of the partner leptons
14. abbreviation for the number of joules of energy given to every coulomb of charge as it passes through a power supply / battery
16. the maximum current that can be drawn from the supply (5,7,7)
17. holds quarks together and also holds protons and neutrons together in the nucleus (6,5)
20. is one which has zero internal resistance (5,6)
22. the highest filled band (7,4)

1. law of conservation of _______ (6,7) states that the total momentum before a collision/explosion is equal to the total momentum after the collision/explosion as long as no external forces are acting
2. have independent horizontal and vertical motions
4. up, down, top, bottom, strange
5. have the same size but act in opposite directions on one object (8,6)
6. made up of quarks
7. abbreviation for a forward biased p-n junction. Electrons cross from the conduction band of the n-type to the conduction band of the p-type where they release energy as a photon of light as they ‘fall’ into the valence band of the p-type
9. is a force which always acts in the opposite direction to an object’s motion
10. is the increase in an observed time interval for an object moving relative to an observer compared to that measured when they are in the stationary frame of reference (4,8)
11. the number of joules of energy per coulomb of charge
15. is supported by the accelerating rate of expansion of the universe ie something appears to be opposing gravity (4,6)
18. abbreviation for the voltage across the terminals of the supply
19. the name for the next band after the valence band (10,4)
21. force mediating particle