Fundamental Physics/Light

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Light comes from light sources for example Sun, Star,Moon, Electric lamp, Gasoline lamp, Fire, Candle, Fire fly

Visible light[edit]

James clerk Maxwell has shown that Visible light travels as Electromagnetic wave of a constant speed in vacuum and in air with a visible wave length 400-700 nm

  • Speed of visible light
  • Wave length of a visible light
  • Threshold frequency
According to Planck, all matter radiates visible light at Threshold frequency, fo . Hence,
  • Energy of visible light

Light and matter[edit]

Visible light interacts with matter creates the following effects