Presentation on theme: "What is light? Does light leave the fire? Does light from the fire reach this couple? Does light from the fire reach the trees in the background? Does."— Presentation transcript:
Does light leave the fire? Does light from the fire reach this couple? Does light from the fire reach the trees in the background? Does light from the fire reach the person who took this picture?
Light is a form of electromagnetic radiation. This means that light is a transfer of energy from one place to another.
Examples of Electromagnetic Radiation: Visible Light Radio Waves X Rays All energy transport processes How would the universe be different without electromagnetic radiation?
A WAVE is a regular series of disturbances that moves through a material medium or through an empty space. An ELECTROMAGNETIC WAVE is an electric and magnetic disturbance that travels through space and transparent materials.
Are ocean “waves” really waves scientifically? Are ocean waves electromagnetic waves?
Electromagnetic waves move at a speed of about 3,000,000,000 meters per second, or 186,000 miles per second. Though they all move at the same speed, different kinds of electromagnetic waves move with different wavelengths and frequencies.
WAVELENGTH The distance between successive crests of the wave. Symbolized by the Greek letter lambda, λ.
FREQUENCY The rate at which crests pass a fixed point. Usually given in number of wavecrests per second, or Hertz (Hz).
So, WAVELENGTH is a measure of DISTANCE and FREQUENCY is a measure of TIME. When WAVELENGTH, λ, is multiplied by FREQUENCY, f, the result is the speed of light, c. C = λf