7. Particles, Waves, and     Paradoxes   Previous PageNext Page
    Questions


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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