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Grade: 11

                        

The emissivity of a spherical body is 0.250. A spherical body with an unknown radius is suspended with a large evacuated enclosure whose walls are at 300K. If the power input required to maintaining the sphere at a temparature of 2500K is 5.5*10^3W, then find the radius of the sphere? (Hint:-By Stefen-Boltzman Law!!) Get the Answer......

4 years ago

Answers : (1)

PASUPULETI GURU MAHESH
126 Points
							
Here we have   e=0.250 ,Ts=300k,  T=2500  Heat H=5.5×103 and Stefen Boltzman constant =5.67×10-8 w/(m2 k4)
we know that  H= area × e × Stefen Boltzman constant ×(T4-Ts4)
r2=H/(4 pi e × Stefen Boltzman constant ×(T4-Ts4)
you substitute all the values in above and get value .
Thank you
4 years ago
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Course Features

  • 110 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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