JEE Main2006PhysicsThermal Properties of MatterActual
Assuming the sun to be a spherical body of radius R at a temperature of T K , evaluate the total radiant power, incident on Earth, at a distance r from the Sun.
Options
- AR ^2 T ^4 r ^2
- B4 r₀^2 R^2 T^4 r^2
- Cr₀^2 R^2 T^4 r^2
- Dr₀^2 R^2 T^4 4 r^2
Correct answer
C. r₀^2 R^2 T^4 r^2
Step-by-step solution
r₀^2 4 r^2 ( T ^4 4 R ^2 )= T ^4 R ^2 r ₀^2 r ^2