Question

1. The Sun’s radius is about 7x105km and recall the speed of light is 3x105km/s.

a. how long would it take a photon produced at the center of the core to exist from the Sun’s surface if it could freely escape? In reality, do you expect a photon’s escape to take a longer or shorter time than what you calculated in part (a)?

Answer 1

Radius of Sun is

And Speed of light ​​​​​​

This time taken by a photon to escape form sun surface if it move freely will be:

Or,

Or,

In reality it takes millions year by photons to reach sun suraface.

The reason behind this is due toh zigzag path travelled by photon in its way out, due to very large number of collision between the photos and other particle as density inside the sun and around the core is very enormous.