Across
- 3. Wave like oscillations that were thought to originate from every point along a wavefront according to Huygen's principle.
- 6. A device that uses thermionic emission and a high potential difference to produce an accelerate beam of electrons.
- 10. When a high frequency photon incident on a metal surface releases an electron.
- 11. The speed of light is ........... this means that it does not change speed regardless of the frame of reference.
- 12. The name of an experiment which was used as direct evidence for the relativistic variation of kinetic energy with speed.
- 13. A frame of reference in which Newton's 1st law is obeyed.
Down
- 1. The mass of a body in motion.
- 2. An object moving relative to an observer appears shorter.
- 4. An observer moving at a constant speed relative to two events will observe a longer time than a stationary observer.
- 5. The ratio of charge to mass for a particle.
- 7. The time interval between two events as measured by an observer who is stationary in relation to those two events.
- 8. This piece of equipment was used by Michelson and Morley to show that the ether did not exist.
- 9. The kinetic energy gained by an electron after it has been accelerate through a potential difference of 1V.