The temperature of the sun can be found out by using

• Wien's displacement law

• Kepler's law of motion

• Stefan's Boltzmann law

• Planck's law

C.

Stefan's Boltzmann law

(a) Wein's law is useful for estimating the surface temperatures of celestial bodies like the moon, sun and other stars.

(b)Kepeler's law described the orbits of planets around the sun or stars around the galaxy in classical mechanics.

(c) The temperature of the surface of the sun was found out to be 5761 k approx by using Stefan's law i.e

      E =  σ T⁴ 

Where E = amount of heat energy radiated / sec area

σ = Stefan's Boltzmann constant

(d)Planck's law is to explain the spectral -energy distribution of radiation emitted by black body absorbs all radiant energy falling upon it, reaches some equilibrium temperature, and then reemits.

So Stefan's Boltzmann law is used to find the temperature of the sun.