| A | B |
|---|
| Longitudinal | Sound waves are an example of this type of wave |
| Transverse | Elecrtomagnetic waves are an example of this type of wave |
| Incident | Ray which hits a mirror |
| reflected | Ray when it has bounced off a mirror |
| refraction | bending of light as it passes from one medium into another |
| Diffraction | Spreading out of waves as they pass through a gap in a barrier |
| Oscilloscope | Device which turns sound waves into a moving picture |
| Wavelength | Distance from the peak of one wave to the peak of the next |
| amplitude | how high the wave is from the centre line - decides the volume |
| frequency | how often a wave passes a point - decides pitch |
| Hertz | Units of frequency |
| normal | imaginary line at right angles to a mirror |
| Gamma | Shortest wavelenth rays |
| X-rays | Shorter than ultraviolet, longer than gamma |
| ultraviolet | shorter than visible light, longer than x-rays |
| visible light | shorter than infrared, longer than ultraviolet |
| microwave | shorter than radio, longer than infrared |
| radio waves | longest wavelength |
| uranium | metal fuel used in fission reactors |
| fission | splitting atoms, used in nuclear power |
| turbine | device with blades which spins |
| generator | turns to make electricity |
| step-up | transformer which boosts voltage |
| step-down | transformer which drops voltage |
| big bang | theory or the origin of the universe |
| red shift | evidence that the universe is expanding |
| cosmic background radiation | microwave remains of the big bang |
| pitch | how high or low a note sounds - depends on frequency |
