Question

The energy generated at the core of the sun is carried to surface by photons in about a million year because
(A) Sun is a huge body
(B) Photons travel very fast
(C) Photons bounce so many times through the dense materials
(D) Photons travel with the speed of light

Answer 1

Hint: To answer this question we should be having a prior knowledge about the structure of the sun and also at the same time about the inner layers of the sun. The speed of the photon and the various obstructions it faces during the travel from the core of the sun to that of the surface of the sun should be taken in consideration while answering this question.

Complete answer:
We should know that if we were talking about any empty space then in that situation the photon would have crossed the path in a matter of seconds because of the high speed.
But as we all know that the core of the sun is composed of various dense matter. So passing through for a photon becomes difficult since it can pass only a few angstroms before interacting with an atom and ends up being re-radiated in a new direction. This results in the formation of a zig-zag path which is so convoluted that it takes about a million years for the photons to reach the surface of the sun.
Hence we can say that the energy generated at the core of the sun is carried to the surface by photons in about a million year because photons bounce so many times through the dense materials.

So the correct option is C.

Note: Photon is defined as the smallest discrete amount or as we can also say that quantum of an electromagnetic radiation. It is considered to be the smallest unit of all the light. Photons are always considered to be in a state of motion. In vacuum the speed of photon is the maximum which is about $2.998 \times {10^8}m/s.$