Statement of a problem № 10405


A 0.50-mW laser produces a beam of light with a diameter of 1.5 mm. (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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