The intensity of solar radiation on Earth is about 1.4 $\times$ 10³ W/m².How many 50-W light bulbs would you have to arrange in an array 3 m from you in order to obtain the same intensity as the Sun? A)8.0 $\times$ 10² B)5.3 $\times$ 10² C)3.2 $\times$ 10³ D)1.0 $\times$ 10⁷ E)1.6 $\times$ 10³

Question

Quizplus · Accepted Answer

To match the solar intensity of 1.4 x 10^3 W/m^2 at 3 meters, calculate the number of 50-W bulbs needed. The intensity at 3 meters is 50 W divided by the area of a sphere with a 3-meter radius (4π(3^2) m^2). Solving gives approximately 3.2 x 10^3 bulbs.

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