# Photon help

1. Feb 8, 2008

### swickey

I have a question that I can't figure out. In the Sun, it takes several hundred thousand years for a photon released in the core to reach the surface. Use the speed of light and the radius of the sun to estimate the escape time for a photon from the center of the sun if there were no interaction.

The suns radius is 696,000km and light travels at 3 x10c/s.....this is where I get lost. Can anyone help me?

2. Feb 8, 2008

### Staff: Mentor

Do you know the equation for relating distance, speed, and time?

3. Feb 8, 2008

### _Mayday_

$$S=\frac{D}{T}$$

It's just a case of plugging the numbers into the equation.

Russ would this qualify as a homework question?