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Unformatted text preview: s P is the power, the rate of energy transfer s Units are Watts/m 2 A P t A E I = Δ Δ = Spherical Waves s A spherical wave propagates radially outward from the oscillating sphere s The energy propagates equally in all directions s The intensity is 2 r 4 P I π = Example problem s Suppose a bell emits sound in all directions (spherical waves). By what factor does the intensity of the sound change if you move from 5 meters away to 17 meters away from the bell?...
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 Spring '00
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 Light, Frequency, 5 meters, 17 meters

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