Solution:
According to Stefan's law, $E \propto T^4$. When temperature is doubled ($2T$), the energy becomes $E' \propto (2T)^4 = 16 T^4$. So, $E' = 16E$.
Radiation energy corresponding to the temperature $T$ of the sun is $E$. If its temperature is doubled, then its radiation energy will be: (1990)
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