NEET Questions Solved

NEET - 2012

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?

 (a)Q/4πR2σ

(b)Q/4πR2σ-1/2

(c)4πR2Q/σ1/4

(d)Q/4πR2σ1/4

       σ stands for Stefan's constant.

From Stefan' law,

      E=σT4

So, the rate energy production

         Q=E×A

          Q=σT4×4πR2

Temperature of star

           T=Q4πR2σ1/4

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