Radio bands

Radio bands

 

5

Gamma Ray

Frequency (Hz) (Wavelength): > 30 EHz (0.01 nm)

Photon energy (eV): 124 keV – 300+ GeV

Gamma ray is also called gamma radiation is an extremely high-frequency electromagnetic radiation. This means that it consists of high-energy photons. Gamma radiation was discovered in 1900 by Paul Villard a French chemist and physicist.

 

8

X-Ray

Frequency (Hz) (Wavelength): 30 EHz – 30 PHz (0.01 nm – 10 nm)

Photon energy (eV): 124 eV to 120 keV

X-radiation is a form of electromagnetic radiation and are shorter than those of UV rays and longer than gamma rays. In some languages X-Ray means Röntgen and this is because it was Wilhelm Röntgen that discovered the x-radiation.

 

Ultraviolet

Frequency (Hz) (Wavelength): 30 PHz – 750 THz (10 nm – 400 nm)

Photon energy (eV): 3.1 eV to 124 eV

UV radiation is present in sunlight and could be dangerous for us humans if we get too much of it. It’s also produced by electric arcs and and specialized lights and in tanning lamps.

 

Visible

Frequency (Hz) (Wavelength): 750 THz – 428.5 THz (400 nm – 700 nm)

Photon energy (eV): 1.7 eV – 3.1 eV

This is the visible spectrum that is visible to the human eye.

 

Infrared

Frequency (Hz) (Wavelength): 428.5 THz – 300 GHz (700 nm – 1 mm)

Photon energy (eV): 1.24 meV – 1.7 eV

Sir William Herschel was an astronomer and discovered the Infrared radiation in 1800. Often in movies you can see infrared cameras detecting people by our body heat.

 

Microwave

Frequency (Hz) (Wavelength): 300 GHz – 300 MHz (1 mm – 1 m)

Photon energy (eV): 1.24 µeV – 1.24 meV

James Clerk Maxwell predicted the existence of micro waves in 1864 and today the microwave technology is often used as an appliance, to warm up food.

 

 

Radio

Frequency (Hz) (Wavelength): 300 MHz – 3 kHz (1 m – 100 km)

Photon energy (eV): 12.4 feV – 1.24 meV

Often used to transmit and receive information or music. Guglielmo Marconi is the one credited for the invention of the radio however Nikola Tesla should also be mentioned because he was at the same time also building radios.