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Power of point source is 18mW. Find the intensity 2.5 m away from the source. Answer - 0.23 mW/m^2

Power of point source is 18mW. Find the intensity 2.5 m away from the source.
 
 
Answer - 0.23 mW/m^2

Grade:12th pass

1 Answers

Arun
25763 Points
2 years ago
The power is radiated isotropically.
 
Intensity = 18 / 4 * pi * 6.25
 
 = 18 / 25 pi
 
 = 0.229 mw/ m^2
 
Hope it helps
 
Regards
Arun

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