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Electromagnetic Spectrum

1. Infra-red- is between microwave and visible on the spectrum and has a long-ish wave length and a low-ish frequency, used for remote controls and thermal imaging

2. Radio Waves- the end of the spectrum, next to microwaves, has the longest wavelength and the lowest frequency, used for communications.

3. Microwaves- second lowest frequency and second longest wavelength, between radio waves and infra red, used for microwave ovens and some transmitters.

4. Gamma rays- the end of the spectrum, next to x-ray, has the shortest wavelength and the highest frequency, used for killing cancer cells and food sterilisation.