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## Main Question or Discussion Point

[STRIKE]If we rearrange Einstein's mass-energy equivallency equation we get.

[tex]m=\frac{E\sqrt{1-\beta^{2}}}{c^{2}}[/tex]

A photon moves at the speed of light making its beta=1. This would make its mass=0.

This would insinuate that in the original equation

[tex]E=\frac{mc^{2}}{\sqrt{1-\beta^{2}}}[/tex]

[tex]E=\frac{0}{0}[/tex]

[tex]\frac{0}{0}[/tex] equals every other number (if my research serves me correctly). Is this why photons can have many frequencys/energies?

However; a photon is only moving at c in a vacuum. What happens in other mediums? Does a photon gain mass? And, if so, what happens to its energy?

Please don't bite my head off for not grasping some seemingly-easy topics. I'm still only young.[/STRIKE]

What is the equation to figure out the energy-mass ratio of photons?

[tex]m=\frac{E\sqrt{1-\beta^{2}}}{c^{2}}[/tex]

A photon moves at the speed of light making its beta=1. This would make its mass=0.

This would insinuate that in the original equation

[tex]E=\frac{mc^{2}}{\sqrt{1-\beta^{2}}}[/tex]

[tex]E=\frac{0}{0}[/tex]

[tex]\frac{0}{0}[/tex] equals every other number (if my research serves me correctly). Is this why photons can have many frequencys/energies?

However; a photon is only moving at c in a vacuum. What happens in other mediums? Does a photon gain mass? And, if so, what happens to its energy?

Please don't bite my head off for not grasping some seemingly-easy topics. I'm still only young.[/STRIKE]

What is the equation to figure out the energy-mass ratio of photons?

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