PY-101 Lecture : Physics_Short notes on Polarisation

[A] Diffraction of the Light
[B] Thin-Film Interference of the light
[C] Scattering of the light
[D] Polarisation of the light

which of the following phenomena most clearly demonstrates the particle nature of light?

a) Interference

b) diffraction.

c) Polarisation.

d) Photoelectric effect.

Sirius is 22 times more luminous than the Sun, and Polaris (the "North Star") is 2,350 times more luminous than the Sun. Sirius appears 23 times brighter than Polaris. How much farther away from us is Polaris than Sirius? What is the distance of Polaris in light-years?