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A low-power laser used in a physics lab might have a power of 0.50 mW and a beam diameter of 3.0 mm. Calculate

  1. the average light intensity of the laser beam, and
  2. compare it to the intensity of a lightbulb producing 100-W light viewed from 2.0 m.

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 
  1. $17 \textrm{ W/m}^2$
  2. The laser is more intense by a factor of 36

Giancoli 7th Edition, Chapter 28, Problem 42


Chapter 28, Problem 42 is solved.

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