Question

If the radius of a star is R and it acts as a black body, what would be the temperature of the star,

Answer 1

Total surface area of the star

= 42.

By Stefan – Boltzmann black body kept at temperature radiates heat per unit surface area per second given by

= 4, - Stefan-Boltzmann constant.Now =42 →42 = 4.

The temperature of the star = √424=1√2√4.

Answer: