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Pythagoras Greek philosopher who thought light was made of beams of particles
Zaccharias and Hans Janssen Dutch scientists who created the first compound (more than one lens) light microscope
Galileo Made his own lenses, which he used to build a telescope, and tried to measure the speed of light with lanterns
Young and Augustin English scientists that proved light behaves like a wave
Energy The capacity to apply a force over a distance
Force A push or pull on an object
Crest The highest point in a wave
Trough The lowest point in a wave
Wavelength The distance from crest to crest or trough to trough of a wave.
Amplitude The height of a wave crest or depth of a wave trough
Frequency The number of cycles per second of a wave
Hertz The unit used to measure frequency
Transverse wave When a wave moves up and down
Compression wave The wave moves back and forth in the same direction (scrunches up and stretches out)
Wave model of light Light is a type of wave that travels through empty space and transfers energy from one place to another.
Visible light Waves of light that you can see
Refraction The bending or changing direction of a wave of light
Spectrum The range of colours or frequencies of visible light
Reflection When a light wave strikes an object and bounces off
Radiant energy Energy, like light, that travels by radiation
Electromagnetic radiation The transmission of energy in the form of waves that extend from the longest radio waves to the shortest gamma rays.
Radio waves A type of electromagnetic radiation that has the lowest energy and the longest wavelength. Can be used for radio and TV broadcasting.
Microwaves Waves that have the shortest wavelength and highest frequency of all the radio waves. Can be used to cook food as well as send information to space and back.
Infrared waves A type of electromagnetic radiation that, relative to light, has a longer wavelength and lower energy and frequency. Can be used in remote controls and thermal images.
Ultraviolet waves A type of electromagnetic radiation that, relative to light, has a shorter wavelength, and higher energy & frequency. Can give sunburns, and can be used in solving crimes.
X-Rays Have much shorter wavelength and higher energy and frequency than UV waves. Can be used to photograph teeth and bones.
Gamma rays Have the highest energy and frequency, and the shortest wavelength portion of the electromagnetic spectrum. Can be used to kill cancer cells.
Created by: mrmcquaid