The light intensity 10 m from a point source is 1000 W/m². The intensity 100 m from the same source is: A) 1000 W/m² B) 100 W/m² C) 10 W/m² D) 1 W/m² E) 0.1 W/m²

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Quizplus · Accepted Answer

The intensity of light from a point source decreases with the square of the distance from the source. So, if the intensity at 10 m is 1000 W/m², the intensity at 100 m will be 1000 W/m² * (10 m / 100 m)² = 10 W/m².

The Light Intensity 10 M from a Point Source Is