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F or the enclosure formed between two concentric spheres as shown below ( R2 = 2R1 ), the fraction
of radiation leaving the surface area A2 that strikes itself is
 
  • a)
    1/4
  • b)
    1/2
  • c)
    1/√2
  • d)
    3/4
Correct answer is option 'A'. Can you explain this answer?
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F or the enclosure formed between two concentric spheres as shown belo...
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Most Upvoted Answer
F or the enclosure formed between two concentric spheres as shown belo...
Radiation is proportional to area enclosed
r1/r2=A1/A2
A1/A2=Pi*R1^2/pi*R2^2
A1/A2=1/4
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F or the enclosure formed between two concentric spheres as shown belo...
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