A metal piece heated to $T_{1}$K. The temperature of the surrounding is $T_{2}$K. the heat in the surrounding due to radiation is proportional to
$(T_1^4-T_2^4)$
$(T_{1}-T_{2})^{4}$
$(T_1^4+T_2^4)$
$(T_1^3-T_2^3)$
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