Temerature Of The Sun And Solar Constant

The value of solar constant is

A planet having surface temperature T, K has a solar constant S. An angle theta is subtended by the sun at the planet:

The value of solar constant is :

What is the value of solar constant ?

The solar constant of earth is 0.8 cal/min.cm? if distance of mercury planet from sun is 0-4 times the distance of earth from the sun then find the solar constant of mercury planet in cal/min cm)

Experimental investigations show that the intensity of solar radiation is maximum for a wavelength 480 nm in the visible ragion. Estimate the surface temperature of sun. (Given Wien's constant b = 2.88 xx 10^(-3) m K ).

The surface temperature of the sun is 'T'K and the solar constant for a plte is 's' . The sun subtends an angle theta at the planet. Then,

Calculate the solar constant on a planet which is approximately 5 A.U. from the sun. Assume the solar constant on earth as 1400 Wm^(-2) .