20 April 2009 Phys 100 Spring 2009
Question 1
Blue light has a greater frequency than red
light. A single photon of blue light collides
with an atom and is absorbed. The atom
subsequently emits a single photon of red
light.
Which of the following is true for the atom
during this entire process?
1. The atom’s energy remains constant.
2. The atom’s energy at the end is larger
than at the start.
3. The atom’s energy at the end is smaller
than at the start.
4. The energy of the atom depends on the
intensity of the light.
– Typeset by FoilT
E
X– 1
