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# act18-1 - Do NOT write on these sheets or take them with...

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Do NOT write on these sheets or take them with you! The next class needs them too! PHYS-1200 PHYSICS II SPRING 2005 Class 18 Activity: Intensity of Waves A . Suppose that waves are being emitted uniformly in all directions from a source, and the waves do not lose energy as they propagate. At a distance of 4.0 meters from the source the intensity of the waves is 0.50 W/m². 1. At what rate is the source radiating energy? That is, what is the power of the source, P s ? 2. Find the intensity of the waves at a distance of 10.0 meters from the source. B . Now suppose that the radiation from the source that was used in part A is confined to a small angle, so that it does not spread uniformly over the surface of a sphere. Instead, all of the radiation passes through a spot that is 1/100 times the area of the sphere. 3. Under the new conditions, what is the intensity of the waves at a distance of 4.0 meters from the source? 4. Under the new conditions, what is the intensity of the waves at a distance of 10.0 meters from the source?

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act18-1 - Do NOT write on these sheets or take them with...

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