Which of the following is not an advantage of using radio frequencies near the hydrogen and hydroxyl wavelengths of 18 and 21 cm, respectively, to search for signals from beyond our planet?

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    Since radio waves are comparatively large, it is easy to achieve good angular resolution with even a small radio telescope compared to optical telescopes, making it easier to pinpoint a potential source.
     The atoms and molecules in this range are components of water, so wavelengths in this region may be chosen for communication by other civilizations.
     Atmospheric emission backgrounds are small at these wavelengths.
     Galactic emission backgrounds are small at these wavelengths.
     Compared to other portions of the EM spectrum, radiation at radio wavelengths travels with a minimum of absorption by interstellar gas and dust.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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Since radio waves are comparatively large, it is easy to achieve good angular resolution with even a small radio telescope compared to optical telescopes, making it easier to pinpoint a potential source.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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