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Question

The sun radiates electromagnetic energy at the rate of 3.9×1026W. Its radius is 6.96×108m.The intensity of sun light at the solar surface will be (inW/m2)

A
1.4×104
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B
2.8×105
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C
4.2×106
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D
5.6×107
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Solution

The correct option is D 5.6×107
I=P4πR2=3.9×10264×3.14×(6.96×108)2=5.6×107w/m2

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