How to calculate wavelength electron given speed

  • Thread starter Adam Rabe
  • Start date
  • #1
33
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Homework Statement


Unit conversion where did i go wrong.PNG

Homework Equations


1/2 mv^2
E = hf
c = f (wavelength)

The Attempt at a Solution


0.5 * (9.109 * 10^-31) * (6 * 10^4)^2 = energy
energy = hf => f = energy/(6.626*10^-34) = 2.47 * 10^12
wavelength (m) = (speed of light) / frequency
wavelength (m) * (1*10^9) = 121235.4

Answer is 12. What gives guys im 4 decimal places too high is there some unit for any of the equations im not getting?
Any help is greatly appreciated.
Adam
 

Answers and Replies

  • #2
ehild
Homework Helper
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Homework Statement


View attachment 204156

Homework Equations


1/2 mv^2
E = hf
That formula is valid for photons. For matter waves, use de Broglie's formula for the wavelength.
Answer is 12. What gives guys im 4 decimal places too high is there some unit for any of the equations im not getting?
Any help is greatly appreciated.
Adam
12 in what units?
 
  • #3
33
0
That formula is valid for photons. For matter waves, use de Broglie's formula for the wavelength.

12 in what units?
omg i got it now. thanks a lot friend
 

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