Photons

• Planck’s law relates the energy of a photon to its frequency or wavelength

• E = energy of a photon

• h = Planck’s constant

• c = speed of light

• = wavelength of light

• The value of the constant h in this equation, called Planck’s constant, has been shown in laboratory experiments to be

• h = 6.625 x 10–34 J s