Two spheres, A & B, are made up of the same material. The radius of A is twice that of B, while the temperature of A is half that of B. What is their ratio of energy emitted per unit time (EA : EB)?(a) 1(b) 1/4(c) 1/2(d) 1/16The question was posed to me during an online interview.I would like to ask this question from Thermal Properties of Matter in division Thermal Properties of Matter of Physics – Class 11

Two spheres, A & B, are made up of the same material. The radius of A

1.	Two spheres, A & B, are made up of the same material. The radius of A is twice that of B, while the temperature of A is half that of B. What is their ratio of energy emitted per unit time (EA : EB)?(a) 1(b) 1/4(c) 1/2(d) 1/16The question was posed to me during an online interview.I would like to ask this question from Thermal Properties of Matter in division Thermal Properties of Matter of Physics – Class 11
Answer» CORRECT choice is (b) 1/4 The best I can explain: Energy EMITTED per UNIT time is given by Ae. e & σ will be the same for both. A = 4πr^2 ∴ EA : EB= rA^2TA ^2/rB^2TB^4 = 41 / 116 = 1/4.

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