- #1

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## 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?

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- Thread starter Cowtipper
- Start date

- #1

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

I'm not sure.

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

- #2

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- #3

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

E = hc/[tex]\lambda[/tex]

Similarly, I have this one:

K=1/2MV[tex]^{2}[/tex]

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...

- #4

hage567

Homework Helper

- 1,509

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Well, I've got this:

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

E = hc/[tex]\lambda[/tex]

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

Look up "de Broglie wavelength."

- #5

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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!

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