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GATE Chemical 2012 | Question: 33

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For the enclosure formed between two concentric spheres as shown ($R_2 = 2R_1$), the fraction of radiation leaving the surface area $A_2$ that strikes itself is

                                                               

  1. $1/4$
  2. $1/2$
  3. $1/\sqrt2$
  4. $3/4$
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