Basic terms of Light for Astronomy Class
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| Mechanical Wave | wave that requires a medium and starts from a vibration in the medium
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| Longitudinal Wave | compressional wave energy transfers in the direction of the medium's vibration
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| Transverse Wave | energy travels perpendicular to the medium's vibration (s wave)
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| Surface Wave | combination of both longitudinal and transverse waves
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| Electromagnetic Wave | wave that does NOT require a medium and starts from a vibrating charged particle
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| Electromagnetic Radiation | emission or transmission of energy through the form of electromagnetic waves.
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| Crest | Peak of wave
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| Trough | bottom of wave
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| Wave Speed | = frequency x wavelength
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| Speed of Light | in a vacuum 3x10^8 m/s
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| frequency | number of waves per second (measured in hertz, Hz)
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| wavelength | distance from crest to crest or trough to trough
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| visible light | Light we can see (ROYGBIV)
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| radio waves | AM & FM - largest wave
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| microwaves | Cellphones
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| x-rays | bones, teeth, security
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| gamma rays | cancer treatment high energy
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| ultra violet | beyond violet - Tanning beds
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| infrared | Heat
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| emisson spectrum | light is split into a spectrum and only certain color bands are present
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| reflection | when waves bounce off something
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| refraction | bending of waves, due to a change in speed
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| diffraction | spreading of waves around corners
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| photons | tiny bundles of mass-less energy
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| emission | to give off
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| transmission | to pass through
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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