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## Homework Statement

How fast would a proton have to travel to have the same momentum as a 6.0-MeV photon

## Homework Equations

P= E / C

## The Attempt at a Solution

P= E / C

= 6.0-MeV / 3.00x10

^{8}m/s

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- #1

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How fast would a proton have to travel to have the same momentum as a 6.0-MeV photon

P= E / C

P= E / C

= 6.0-MeV / 3.00x10

- #2

Hootenanny

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Welcome to Physics Forums.## Homework Statement

How fast would a proton have to travel to have the same momentum as a 6.0-MeV photon

## Homework Equations

P= E / C

## The Attempt at a Solution

P= E / C

= 6.0-MeV / 3.00x10^{8}m/s

You need to be careful with your units here, your mixing natural units and S.I. units. You need to pick a system and stick to it.

- #3

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## Homework Statement

How fast would a proton have to travel to have the same momentum as a 6.0-MeV photon

## Homework Equations

P= E / C

## The Attempt at a Solution

P= E / C

= 6.0-MeV / 3.00x10^{8}m/s

What's the problem here? Have you even put in any thought to it?

Yes P = E/c but if you're going to use that you need to make sure your E and c are in SI - that is - m/s and J

Once you find that you can equate that with the momentum of a proton - mv. You can look up the mass of the proton, and solve for v

- #4

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That was my problem, I hadn't realized that i had the different units. Thank you!