Question

# The solar constant is the amount of heat energy received per second per unit area of a perfectly black surface placed at a mean distance of the Earth from the Sun, in the absence of Earths atmosphere, the surface being held perpendicular to the direction of Suns rays. Its value is 1388 W/m2.If the solar constant for the earth is s. The surface temperature of the sun is TK, D is the diameter of the Sun, R is the mean distance of the Earth from the Sun. The sun subtends a small angle θ at the earth. Then correct options is/are :

A
s=σT4(DR)
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
s=σT44(DR2)
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
s=σT44θ2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
s=σT44(RD)2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

## The correct option is B s=σT44(DR2)Total energy intercept = Solar Constant x AreaEintercept=ksAearth σAsunT4=ksAearth ks=σT4AsunAearth=σT44π(D2)2πR2=σT4(DR)2 Hence, solar constant is σT4(DR)2

Suggest Corrections
0
Join BYJU'S Learning Program
Select...
Related Videos