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    Ive got this question that says 'The 211 mm line of atomic hydrogen is often used in studying stars or galaxies. To which region of the electromagnetic spectrum does this belong?'

    I know that the answer is infra red from the mark scheme but i really cant understand how. The infra red region is less than 1mm and greater than 0.7 micrometres according to my textbook, so how could 211 mm possibly be the infra red region?

    Any help would be much appreciated
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    a mis-print maybe?
 
 
 
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