KVPY 2019 SB SX Exam Previous Papers

Question : 40 of 120

Marks: +1, -0

Three large identical plates are kept close and parallel to each other. The outer two plates are maintained at temperature T and 2T, respectively. The temperature of the middle plate in steady sate will be close to

1.1 T
1.3 T
1.7 T
1.9 T

Validate

Solution:

Rate of heat absorbed = Rate of heat emitted

σAT^4 + σA(2T)^4 = σ2ATm^ 4

T_m=(17/2)^{1\/4}= 1.7 T

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