Question

The rate at which the radiant energy reaches the surface of earth from the sun is about 1.4 KW/m². The distance from the earth to the sun is about 1.5 10¹¹ m, and the radius of sun is about 0.7 10⁹m If the sun radiates as ideal black body, what is the temperature of its surface?

• A. 3800 K (approx)
• B. 4800 K (approx)
• C. 5800 K (approx)
• D. 6800 K (approx)

Answer 1

The correct option is C 5800 K (approx)

Let P be power of sun Hence energy crossing through unit area