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Question: 

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.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

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

(1:28)

Chapter 28, Problem 42 is solved.

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