Physics_10_-_Spring_2004_-_Muller_-_Midterm_2 - Physics 10...

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Physics 10 Midterm exam 2 Part A – Essay Questions April 15, 2004 Last name____________________ First name____________________SID___________ Essay questions (20 pts): pick one and only one to answer. Write a page or two (or whatever is appropriate) on this sheet. Cover the important points in a clear and concise manner – as if you have only a few minutes to tell the President, your roommate, or your parent, what that person needs to know. Clear, effective writing is important. 1. Some people are surprised by the statement that light does not always travel “at the speed of light.” What does that mean? What are the implications of “slow light”? What are the phenomena that result, and what practical applications come from the fact that light sometimes travel slower than the value c = 3 x10 8 m/sec. 2. Light is a wave. But according to quantum mechanics, it is also “quantized.” What does that mean? Describe some practical applications of light that make use of the fact that both it and energy levels are sometimes quantized.
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