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Question

a thin square plate with each side equal to 10cm , is heated by a blacksmith . the rate radiated energy by the heated plate is 1134W the temp of hot square plate is

( σ = 5.67 X 10^-8 Wm²/k⁴ emissivity of plate =1)

ANS 1000K

Joshi sir comment

according to the Stefans law P = AeσT⁴

so 1134 = 0.02*1*5.67*10^-8*T⁴(area of both the faces are considered)

so 1134*10¹⁰/11.34 = T⁴

so T = 1000

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