1.

If the sun?s surface radiates heat at \[6.3\times {{10}^{7}}W{{m}^{-2}}\]. Calculate the temperature of the sun assuming it to be a black body \[(\sigma =5.7\times {{10}^{-8}}W{{m}^{-2}}{{K}^{-4}})\] [BHU (Med.) 2000]

A.            \[5.8\times {{10}^{3}}K\]
B.            \[8.5\times {{10}^{3}}K\]
C.            \[3.5\times {{10}^{8}}K\]
D.            \[5.3\times {{10}^{8}}K\]
Answer» B.            \[8.5\times {{10}^{3}}K\]


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