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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
28
Quantum Mechanics of Atoms
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28-2: Wave Function, Double-Slit
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28-3: Uncertainty Principle
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28-6 to 28-8: Quantum Numbers, Exclusion Principle
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28-9: X-Rays
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28-11: Lasers
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 42
Q

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.
A
  1. 17 W/m217 \textrm{ W/m}^2
  2. The laser is more intense by a factor of 36
Giancoli 7th Edition, Chapter 28, Problem 42 solution video poster
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