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Ch 3 Radiation Pt 1

Vocabulary

TermDefinition
Electromagnetic Radiation light waves that transfer energy in the form of electric and magnetic fields
Electric Field extends outward in all directions from a charged particle, such as a proton or electron
Magnetic Field accompanies any changing electric field and governs magnetized objects
Wave disturbance that repeats itself cyclically in both time and space
Energy must be transferred in order to do work on, or heat, an object
Medium material through which a wave could travel
Wavelength distance from one wave crest/peak to the next
Amplitude maximum deviation of a wave above or below equilibrium (wave height)
Equilibrium condition of a system when its energy does not change (undisturbed state)
Trough maximum departure of a wave below equilibrium
Crest maximum departure of a wave above equilibrium (a.k.a. a peak)
Frequency number of wave crests passing a given point every second; in units of Hertz (Hz)
Wave Period amount of time for a wave to repeat itself at a specific point in space
Velocity an object's speed and in which direction it is moving
Electromagnetic Spectrum complete range of EM radiation from radio waves to gamma rays
Visible Spectrum small range of the EM spectrum that humans can see from red through blue/violet light
Speed of Light c = 3x10^8 m/s; is the same for all electromagnetic waves
Diffraction ability of waves to bend around corners and spread out through openings
Interference ability of two or more waves to interact and either amplify or cancel each other
Opacity measure of a material's ability to block electromagnetic radiation, such as Earth's atmosphere
Created by: john_bailey720
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