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Unit 8C Spectrum

EM Spectrum/Theories of Universe

TermDefinition
wavelength the distance between any two corresponding points on successive oscillations of a wave, such as from peak to peak
electromagnetic spectrum grouping of all possible energy levels of electromagnetic radiation from radio waves to gamma rays
electromagnetic radiation the type of energy released by stars consisting of electric and magnetic waves that travel at the speed of light
radiation transfer of energy by the movement of electromagnetic waves or subatomic particles
radio waves electromagnetic waves with long wavelengths and low frequencies
microwaves electromagnetic waves that are between radio waves and infrared waves in the electromagnetic spectrum
infrared waves electromagnetic waves with longer wavelengths than visible light but shorter than micro waves
light waves electromagnetic waves with a frequency between ultraviolet and infrared waves, usually visible
ultraviolet waves electromagnetic waves with a shorter wavelength than visible light but longer than X-rays
x-rays electromagnetic waves that are the second highest in energy and are used in medical and astronomical applications
gamma rays electromagnetic waves with the highest energy; produced by supernovas, destruction of atoms, or decay of radioactive material.
radio astronomy the study of celestial objects that emit radio waves
cosmic microwave background (CMB) electromagnetic radiation left over from early development of the universe; it fills the universe; key proof of the Big Bang theory
redshift the change in wavelength that allows us to determine that an object is moving away from us
frequency the number of waves that pass a point of reference in a certain time (per second)
amplitude the height of the wave from center line to either the crest or the trough
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