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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)
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B
4800 K (approx)
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C
5800 K (approx)
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D
6800 K (approx)
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Solution

The correct option is C 5800 K (approx)

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


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