PH2 DEFINITIONS

1. this is the process of feeding energy into the amplifying medium of a laser to produce a population inversion (7)
5. one amp of current is a coulomb of charge being moved, per second (6)
6. the distance between two identical points on adjacent waves (10)
7. the time taken for one complete cycle (6)
9. this states that for a metallic conductor at a constant temperature, the current flowing through it, is directly proportional to the P.D. across it (4, 3)

2. so much so that there is significant time difference in pulses that travel the 'shortest' route by comparison to that taken by those travelling the 'longest- zig zag' route (5, 4, 1)
3. energy in the form of waves are said y be polarised, if the oscillations of each photon are orientated into the same place (note: only transverse waves can be polarised) (12)
4. the greatest displacement of any particle from its mean position (equilibrium) (9)
8. the number of cycles per second (9)
10. this is the potential between two points in a circuit, if 1 joule of energy is converted into other forms when 1 coulomb of charge moves between the points (3, 4)

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