Electromagnetic Waves
19 Jan 2022
EM Waves
Types of waves
EM Waves
Radio Waves
Microwaves
Infrared radiation
Visible light
Ultraviolet light
X-rays
Gamma-rays
Radio waves
Frequency lower than 300GHz
Wavelength more than 1mm
Carry the least amount of energy.
Microwaves
Frequency: 300GHz to 30000GHz
Wavelength: 1mm to 25micrometre
Infrared radiation
Frequency: 30000GHz to 300000GHz
Wavelength: 25 micrometres to 2.5 micrometres
Visible light
740nm
Ultraviolet light:
Wavelength: 400nm - 1nm
X-rays
Wavelength: 1nm - 1pm
Gamma-ray
10pm - 1zm
Bit flip caused by cosmic rays
EM waves can come from neutron stars magnetic fields.
Why are EM waves unique?
Many objects in space produce Em waves of some sort.
Uses of EM waves and Importance of each type of wave
Radio waves - radio and television.
Microwaves - satellite communications and cooking food.
Infrared - Electrical heaters, cooking food and infrared cameras.
Visible light - Fibre optic communications.
Ultraviolet - Energy efficient lamps, sun tanning.
X-rays - Medical imaging and treatments.
Gamma rays come from supernovas and originate from the settling process of an excited nucleus of a radionuclide after it undergoes radioactive decay. In contrast, X-rays are produced when electrons strike a target or when electrons rearrange within an atom. Stars can form within cosmic dust, infrared light can penetrate cosmic dust
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