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A red star and a green star radiate energy at the same rate which star is bigger in size ?

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red star

green star

both have same size

can’t say anything

answer is A.

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Detailed Solution

$\frac{Q}{t} = σ A T^{4} = const.$

$T_{red} < T_{green} (λ_{red} T_{red} = λ_{green} T_{green})$

$∵ A \propto \frac{1}{T^{4}}$

$A_{red} > A_{green}$

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