A 0.50-mW laser produces a beam of light with a diameter of 1.5 mm. (a) What is
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(a) What is the average intensity of this beam?
(b) At what distance does a 150-W lightbulb have the same average intensity as that found for the laser beam in part (a)? (Assume that 5.0% of the bulb's power is converted to light.)
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