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  1. electromagnetic spectrum
    the arrangement of electromagnetic radiation according to wavelength
  2. photon
    a small packet of light energy
  3. spectroscopy
    the study of the properties of light that depend on wavelength
  4. continuous spectrum
    an uninterrupted band of light emitted by an incandescent solid, liquid, or gas under pressure
  5. absorption spectrum
    a continuous spectrum produced when white light is passed through a cool gas under low pressure; The gas absorbs selected wavelengths of light, and the spectrum looks like it has dark lines superimposed.
  6. emission spectrum
    a series of bright lines of particular wavelengths produced by a hot gas under low pressure
  7. Doppler effect
    the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer
  8. refracting telescope
    a telescope that uses a lens to bend and concentrate the light from distant objects
  9. chromatic aberration
    the property of a lens whereby light of different colors is focused at different places
  10. reflecting telescope
    a telescope that concentrates light from distant objects by using a concave mirror
  11. radio telescope
    a telescope designed to make observations in radio wavelengths
  12. photosphere
    the region of the sun that radiates energy to space; the visible surface of the sun
  13. chromosphere
    the first layer of the solar atmosphere found directly above the photosphere
  14. corona
    the outer weak layer of the solar atmosphere
  15. solar wind
    streams of protons and electrons ejected at high speed from the solar corona
  16. sunspot
    a dark spot on the sun, which is cool by contrast to the surrounding photosphere
  17. prominence
    a concentration of gases above the solar surface that appears as a bright archlike structure
  18. solar flare
    a sudden and tremendous eruption in the solar chromosphere
  19. aurora
    a bright display of ever-changing light caused by solar radiation interacting with the upper atmosphere in the region of the pole
  20. nuclear fusion
    the way in which the sun produces energy; Nuclear fusion occurs when less massive nuclei combine into more massive nuclei, releasing tremendous amounts of energy.
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