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Kinetic energy of an electron

  • Thread starter Cowtipper
  • Start date
  • #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?
 

Answers and Replies

  • #2
Redbelly98
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Find an equation in your textbook that deals with the wavelength of electrons or particles in general. That would be a start.
 
  • #3
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Well, I've got this:

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
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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
36
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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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