CP5 EM Waves

3. Vibrations of voltage and current in radio aerials.
6. Electromagnetic radiation with a shorter wavelength than visible light.
7. An imaginary line at right angles to a surface where a ray of light hits it.
10. The change in direction when a wave changes speed going from one medium into another.
11. A place where there is no matter at all.
13. The order colours of the visible spectrum from long to short wavelength.
16. Cancer treatment in which a patient is given gamma radiation to kill the cancer cells.
17. A hazard of receiving high frequency electromagnetic waves.
18. Electromagnetic waves that can be detected by the human eye.
20. The entire frequency range of electromagnetic waves.
22. Deoxyribonucleic acid. Chemical that makes up genes and chromosomes.

1. Absorbing radiation of one wavelength and re-emitting at a visible wavelength.
2. Electromagnetic radiation with a longer wavelength than infrared radiation.
4. Waves that all travel at the same speed in a vacuum, and are all transverse.
5. Electromagnetic radiation we feel as heat and has a longer wavelength than visible light.
8. A change in the DNA instructions in a cell.
9. The boundary between two materials.
10. A straight line with an arrow showing the direction of a beam of light.
12. A wave in which the vibrations are at right angles to the direction the wave is travelling.
14. The angle between an incoming light ray and the normal.
15. Electromagnetic radiation that has a shorter wavelength than ultraviolet radiation.
19. Electromagnetic radiation with the shortest wavelengths and highest frequencies.
21. Electromagnetic radiation with the longest wavelengths.