The amount of radiant power produced by the sun is approximately 3.9 ✕ 1026 w. assuming the sun to be a perfect blackbody sphere with a radius of 6.96 ✕ 108 m, find its surface temperature (in kelvins).

T=5797.8  K

Explanation:

Given that

Power P = 3.9 x 10²⁶ W

Radius ,r= 6.96 x 10⁸ m

We know that ,From Plank's law

P = σ A T⁴

σ = 5.67 x 10 ⁻⁸

A= Area ,T= Temperature ( in Kelvin)

Now by putting the values

T=5797.8  K

The temperature of surface will be 5797.8 K

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