Kinetic energy of an electron

[Cowtipper]

Homework Statement

If an electron has a measured wavelength of 0.850 x 10^-10 m, what is its kinetic energy?

Homework Equations

I'm not sure.

The Attempt at a Solution

And once again, I'm not too sure. Where do I start?

 

[Redbelly98]

Find an equation in your textbook that deals with the wavelength of electrons or particles in general. That would be a start.

 

[Cowtipper]

Well, I've got this:

I'm not sure if it's one to use.

E = hc/$$\lambda$$

Similarly, I have this one:

K=1/2MV$$^{2}$$

However, I'm not sure where or how to use it in this instance, or if I have to use it at all.

Man, this stuff is getting tough. I was doing well there for a while too...

 

[hage567]

Well, I've got this:

I'm not sure if it's one to use.

E = hc/$$\lambda$$

No, this equation will not work. Look back in your notes and try to figure out why.

Look up "de Broglie wavelength."

 

[Cowtipper]

No, this equation will not work. Look back in your notes and try to figure out why.

Look up "de Broglie wavelength."

Aha! That is all I needed to know.

Thanks a lot!