electromagnetic waves - A group of waves that all travel at the same speed in a vacuum (c=3×108 m/s) and are all transverse., frequency - The number of vibrations (or the number of waves) per second. One hertz (Hz) is one wave per second., diffuse reflection - Reflection from a rough surface, where the reflected light is scattered in all directions., filter - Something that only transmits certain colours and absorbs the rest., luminous - Giving off light. The Sun and light bulbs are luminous objects., specular reflection - When light is reflected evenly, so that all reflected light goes off in the same direction. Mirrors produce specular reflection., visible light - Electromagnetic waves that can be detected by the human eye., visible spectrum - The seven colours that make up white light. ROYGBIV, white light - Normal daylight, or the light from light bulbs, is white light., microwaves - Electromagnetic radiation with a longer wavelength than infrared radiation but a shorter wavelength than radio waves., radio waves - Electromagnetic radiation with the longest wavelengths and lowest frequencies., X-rays - Electromagnetic radiation that has a shorter wavelength than ultraviolet radiation but a longer wavelength than gamma rays., oscillations - Movements back and forth. In radio aerials, oscillations are repeated changes in voltage and current., fluorescence - Absorbing radiation of one wavelength and re-emitting the energy at a different wavelength (usually so that it becomes visible)., radiotherapy - Cancer treatment in which a patient is given gamma radiation to kill the cancer cells., DNA - Deoxyribonucleic acid. Chemical that makes up genes and chromosomes. It contains the instructions for a cell’s growth and activity., mutation - A change in the DNA instructions in a cell., skin cancer - A cancer or cancerous tumour on the skin.,

Electromagnetic Spectrum

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