A thin square steel plate with each side equal to $10$ cm is heated by a blacksmith. The rate of radiated energy by the heated plate is $1134 W$ . The temperature of the hot steel plate is ....... $K$ (Stefan's constant $\sigma = 5.67 \times {10^{ - 8}}watt\;{m^{ - 2}}{K^{ - 4}}$, emissivity of the plate = $1$ )
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(b) The rate of radiated energy $\frac{Q}{t} = P = A\varepsilon \sigma {T^4}$
$ \Rightarrow 1134 = 5.67 \times {10^{ - 8}} \times {(0.1)^2}{T^4}$
==> $T = 1189\;K$
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