If the radius of a star is $R$ and it acts as a black body,what would be the temperature of the star,in which the rate of energy production is $Q$? ($\sigma$ stands for Stefan's constant)
- A$\frac{Q}{4\pi \sigma R^2}$
- B$\left( \frac{Q}{4\pi \sigma R^2} \right)^{1/2}$
- C$\left( \frac{Q}{4\pi \sigma R^2} \right)^{1/4}$
- D$\left( \frac{4\pi \sigma R^2}{Q} \right)^{1/4}$
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