Question

26) Star A and star B are the same surface temperature. Star A has twice the radius as star B. How does the amount of energy radiated per unit area from the surface of A compare to surface of B?

Answer 1

1/4

Step-by-step explanation:

Total radiation energy depends on temperature, so
`E_A=E_B`

Radius
`R_A=2R_B`

so the surface area
`S_A=4 S_B`

energy per unit area

`(E_A)/(S_A)=(1)/(4)(E_B)/(S_B)`