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The sun emits light having maximum intensity at a wavelength 468nm. Assume emissivity of sun is 1. Calculate its surface temperature. σ= 5.67*10^-8W/m^2K^4.

(a) 6800K

(b) 3400K

(c) 6196K

(d) 7200K

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Right choice is (c) 6196K

The explanation: Using Wein’s displacement law: λT = 2.9*10^-3,

we get T = 2.9*10^-3/(468*10^-9)

= 6196 K.

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