Electro magnetic waves
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- Microwave is a high frequency and high energy wave. As against, the radio wave is a low frequency and low energy wave. Radio wave is omnidirectional in nature. Conversely, a microwave is unidirectional.
- Infrared (IR) light is used by electrical heaters, cookers for cooking food, short-range communications like remote controls, optical fibres, security systems and thermal imaging cameras which detect people in the dark. One of the most common uses of infrared radiation is in heat-sensitive thermal imaging cameras.
- Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light.
- Ultraviolet light, commonly known as UV light, is one type of electromagnetic radiation that comes from the sun and is transmitted at different wavelengths and frequencies. On the electromagnetic spectrum, UV light falls between visible light and X-rays and can be split into UVA or near UV, UVB or middle UV, and UVC or far UV.
- X-rays are a form of electromagnetic radiation similar to radio waves, microwaves, visible light and gamma rays. X-ray photons are highly energetic and have enough energy to break up molecules and hence damage living cells. When X-rays hit a material some are absorbed and others pass through
- Gamma rays are the highest energy type of electromagnetic radiation and reveal information about the sources that created them. Gamma ray signatures can be used to detect the difference between radioactive materials that pose a security risk and those that do not.
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