The Radius of a Star Is 6

Multiple Choice

The radius of a star is 6.95 × 10⁸ m,and its rate of radiation has been measured to be 5.32 × 10²⁶ W.Assuming that it is a perfect emitter,what is the temperature of the surface of this star? (σ = 5.67 × 10^-8 W/m² ∙ K⁴)

A) 6.27 × 10³ K
B) 8.25 × 10³ K
C) 8.87 × 10³ K
D) 3.93 × 10⁷ K
E) 5.78 × 10⁷ K