Light

Light – An Electromagnetic Wave Light is a “wave”. Light is special because light can travel through vacuum of outer space.

Light – An Electromagnetic wave An electromagnetic wave: is a wave that has both electric and magnetic parts, does not require a medium, and travels at the speed of light

Electromagnetic spectrum The term “Light” usually refers to the visible part of the electromagnetic spectrum. Video – Electromagnetic Spectrum

Wavelength and Frequency Wavelength – the distance between successive crests on a wave. Frequency – the number of cycles a wave goes through in one second.

More on the EM Spectrum Longer Wavelength Shorter Wavelength (Low Energy) Shorter Wavelength (High Energy)

Red Orange Yellow Green Blue Indigo Violet White Visible Light Continuous sequence of colors. Color sequence is called the visible spectrum Red Orange Yellow Green Blue Indigo Violet ROY-G-BIV

The Production of Light Incandescence Hot things glow

The Production of Light Search Results Electric discharge Electric current passing through a gas

The Production of Light Bioluminescence Chemiluminescence in living organisms

The Production of Light Phosphorescence and Fluorescence Material absorbing U.V light In phosphorescence, visible light is emitted over a period of time In fluorescence, immediately Phosphorescent powder under visible light, ultraviolet light, and total darkness

The Production of Light                                                                                           Phosphorescent powder under visible light, ultraviolet light, and total darkness. Triboluminescence - friction from scratching, crushing, or rubbing certain crystals

The Production of Light Light-Emitting Diode (LED) Electric current flowing in semiconductors