25. What happens when hydrogen atoms emit radiation? How
is the frequency of radiation related to energy levels within the
atom?
26. In what part of the spectrum do the lines occur that
correspond to transitions between the n = 1 and higher levels? Where
do the n = 2 to higher transitions appear in the spectrum? Where
are the n=3 to higher absorptions or emissions found?
27. What happens to the spectrum of a galaxy that is moving
rapidly toward us? What happens if the galaxy is moving rapidly
away? Which of these is a blue shift, and which is a red shift,
and why?
28. Hubble discovered that the speed with which a galaxy
is moving away from us is proportional to its distance from us.
Show that this implies that the expanding universe arose from a
relatively restricted region of space.
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