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Chapter 23 Vocab
Terms in this set (25)
the range of wavelengths or frequencies over which electromagnetic radiation extends.
a particle representing a quantum of light or other electromagnetic radiation, which carries energy proportional to the radiation frequency but has zero rest mass.
pressure exerted upon any surface exposed to electromagnetic radiation, the pressure implies an interaction between electromagnetic radiation and bodies of various types of gases.
science that deals with the use of the spectroscope and spectrum analysis.
emission spectrum that consists of a continuum of wavelengths.
optical device for producing and observing a spectrum of light or radiation from any source.
dark line emission spectrum
dark line resulting from emission or absorption of light in a narrow frequency range.
bright line emission spectrum
emission spectrum consisting of bright lines against a dark background.
change of frequency of a wave for an observer moving relative to its source.
optical telescope that uses a lens as its objective to form an image, image refracted through the telescope is upside down.
also known as color/purple fringing, is a common optical problem that occurs when a lens is either unable to bring all wavelengths of color to the same focal plane or when wavelengths of color are focused at different positions.
reddish gaseous layer immediately above the photosphere of the sun or another star, together with the corona it constitutes the star's outer atmosphere.
rarefied gaseous envelope of the sun and other stars, sun's corona is normally visible only during a solar eclipse when it is seen as an irregularly shaped pearly glow surrounding the darkened disk of the moon.
continuous flow of charged particles from the sun that permeates the solar system.
spots or patches appearing on the sun's surface from time to time, appears dark by contrast with its surroundings.
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Suppose a comet were discovered approaching the Sun, one whose orbit would cause it to collide with Earth 20 months later, after perihelion passage. (This is approximately the situation described in the science-fiction novel Lucifer’s Hammer by Larry Niven and Jerry Pournelle.) What could we do? Would there be any way to protect ourselves from a catastrophe?
Contrast the motion of the disk stars and that of the halo stars. Why do their orbits differ?
If we do find life on Mars, what might be some ways to check whether it formed separately from Earth life, or whether exchanges of material between the two planets meant that the two forms of life have a common origin?
Molecules that are transparent to visible light but absorb and re-emit infrared light are known as "greenhouse gases ." What are the two greenhouse gases most responsible for absorbing infrared light in Earth's atmosphere?