Light radiation

Wavelength of light radiation

Micrometres (pm) = 10-6 m Nanometres (nm) = 10-9 m

Example: Radiation of colour green: 1 = 550 nm = 0.55 pm

Energy of a photon

hc

E(electron-volt, eV) = hv = —

1

where h is Planck’s constant, v is the frequency, c is the speed of light and 1 is the wavelength, or more simply E = 1.24/1 with E in eV and l in pm.

image291 Подпись: 2.25 eV

Example: Energy of photon with a wavelength of 550 nm:

Updated: August 25, 2015 — 4:54 am