By Robert T. Dixon
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Additional info for Dynamic Astronomy
Light only is a small portion of the electromagnetic spectrum, which includes radio, television, heat (infrared), ultraviolet radiation, x rays, cosmic rays. What another? and is It is it that their wavelength. 7. One wavelength any point on a wave to the next similar waves are very long, ranging in wavelength 900 m. Television wavelengths range from 1 to 10 m. The wavelengths is the distance from point on that wave. 0000007 this range; 20 1 A= 10 angstrom methods of astronomy much 10 m. 0000004 generally used for wavelengths of and it is denoted by the symbol A.
20). The exposure meter used in photography is a practical application of this phenomenon, called the photoelectric effect. Light falls on a sensitive surface and drives off electrons. The resulting flow of electrons constitutes an electric current that in turn produces a reading on the meter. is measure the brightness of used to From these experiments must be used we A very sensitive device of this type stars. see that both the wave idea and the particle idea to describe light. 18 Dark grating.
Is the fact that light of different colors refracted by glass or by which is composed of some other all colors, separated into these various colors by dispersion, thereby producing a trum of trans- may full O is be spec- colors. is passed through a narrow slit, then through a collimating which bends the rays so that they will be parallel as they pass through the prism. The light, which has been broken into its various colors, is then focused Light from a star lens, onto a photographic plate. The picture of the spectrum, called a spectrogram, consists of a series of slit, each representing a slightly different wavelength.
Dynamic Astronomy by Robert T. Dixon