Need help with a question about momentum

[stayfocused]

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 / 3.00x10⁸m/s

 

[Hootenanny]

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 / 3.00x10⁸m/s

Welcome to Physics Forums.

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.

 

[CaptainEvil]

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 / 3.00x10⁸m/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

 

[stayfocused]

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