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The light intensity a certain distance away from a spherically-symmetric light source is 1200 W/m2. What...

The light intensity a certain distance away from a spherically-symmetric light source is 1200 W/m2. What would be the new intensity (in W/m2) if the source power were tripled while the observation point is made to be five times farther from the source?

A. 156

B. 975

C. 144

D. 245

E. None of these

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