Question

Radiation intensity ‘I’ normal to the surface is given by __________

(a) ICosθ

(b) Itanθ

(c) ICotθ

(d) Isinθ

I had been asked this question in final exam.

I want to ask this question from Solar Constant in division Solar Energy of Energy Engineering

Answer 1

The correct answer is (a) ICosθ

To elaborate: I = ICosθ, Let θ = Angle between an incident beam radiation I and the normal to the plane surface. And the θ is referred to as incident angle. And further by this formula latitude angle, declination, hour angle, zenith angle and solar azimuth angles are found out.