A red star and a green star radiate energy at the same rate which star is bigger.

Options

A. Red
B. Green
C. Both have same size
D. can't be say anything

Answer

D

Explanation

`(Q)/(t) = sigmaAT^(4)` = same but `T_("red") lt T_("green")`
as `lambda_("red") T_("red") = lambda_("green") T_("green")` (see `VIBGYOR`)
`implies` Area of red star is greater