How can light carry energy via momentum, but have no mass??

Question

How can light carry energy via momentum, but have no mass??

In: 1

Answer 1

Because of the famous e=mc^2

Mass can be converted into a lot of energy, and energy can be converted into a little bit of mass.

Now the actually physics is more complicated, but to put simply if e=mc^2 (where c is the speed of light) then m=e/c^2

So you can substitute back and force between m and e, it’s not entirely that simple, the math is a bit more complex, but that is the premise.