Electromagnetic Waves around of Visible Rays


Types of Electromagnetic Wave

Electromagnetic waves are classified based on the length of the wavelength.The length of the antenna used in wireless communication is said to be the most efficient when it is half the wavelength of the electromagnetic wave.The energy of an electromagnetic wave increases as the wavelength gets shorter.

c = λ·υ

c: speed of light(3×108m／s)
λ: wavelength(m)
υ: frequency(Hz)

Electromagnetic waves goes at a speed of 300,000 km per second in a vacuum. Nothing is faster than light in this world.

Representative Wavelength Frequency Photon Energy
Gamma ray 50 fm 6 ×1021 Hz 25 MeV
X-ray 50 pm 6 ×1018 Hz 25 keV
ultraviolet ray 100 nm 3 ×1015 Hz 12 eV
Visible light 550 nm 5 ×1014 Hz 2 eV
Infrared ray 10 μm 3 ×1013 Hz 120 meV
Microwave 1 cm 3 ×1010 Hz 120 μeV
Radio wave 1 km 3 ×105 Hz 1.2 neV