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JEE Main 2004 (AIEEE) · Thermal Radiation: Black Body, Stefan & Wien

Thermal Radiation: Black Body, Stefan & Wien question from JEE Main 2004 (AIEEE)

Q103JEE Main 2004 · AIEEEMedium

Thermal Radiation: Black Body, Stefan & Wien

If the temperature of the sun were to increase from $T$ to $2T$ and its radius from $R$ to $2R$ , then the ratio of the radiant energy received on earth to what it was previously will be

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Answer: (d)

Energy received on earth $\propto$ power of the sun $\propto R^2 T^4$ .
Ratio $= 2^2 \times 2^4 = 4 \times 16 = 64$
So the answer is (d) 64.

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