Rate of cooling at $600K$ , if surrounding temperature is $300K$ is $R$ . The rate of cooling at $900K$ is
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(a) Rate of cooling $ \propto ({T^4} - T_0^4)$ ==> $\frac{{{R_1}}}{{{R_2}}} = \frac{{(T_1^4 - T_0^4)}}{{(T_2^4 - T_0^4)}}$
==>$\frac{R}{{{R_2}}} = \frac{{{{(600)}^4} - {{(300)}^4}}}{{{{(900)}^4} - {{(300)}^4}}}$or ${R_2} = \frac{{16}}{3}R$
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