GATE Chemical 2012 | Question: 33

Question

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

                                                               

• A. $1/4$
• B. $1/2$
• C. $1/\sqrt2$
• D. $3/4$