Calculate DeBroglie Wavelength & Kinetic Energy of Electron

Click For Summary

Homework Help Overview

The discussion revolves around calculating the DeBroglie wavelength and kinetic energy of an electron at specified energy levels. The subject area includes quantum mechanics and wave-particle duality.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to use the DeBroglie wavelength formula and expresses confusion regarding the application of energy values in the calculations. Some participants question the accuracy of the formulas being used and the steps taken in the calculations.

Discussion Status

Participants are actively engaging with the problem, with some providing guidance on the approach. There is a recognition of potential issues in the original poster's method, and clarification is being sought regarding the formulas and calculations involved.

Contextual Notes

There is a mention of using specific energy values (1.0 eV and 100 eV) and a wavelength corresponding to visible red light (650 nm), which may impose constraints on the calculations. The discussion also hints at possible misunderstandings in the application of the equations.

SGL18
Messages
12
Reaction score
0

Homework Statement


What is the DeBroglie wavelength of an electron whose energy is (a) 1.0eV (b) 100eV?
What is the kinetic energy in eV of an electron whose DeBroglie wavelength is that of visible red light at 650nm?


Homework Equations


λ=h/p = h/mv h = Planck's constant mv = particle

The Attempt at a Solution

 
Physics news on Phys.org
Well, what have you tried? Where did you get stuck?
 
i used the formula λ=h/(Em)^1/2 and correctly got 1eV to equal 1.23x10^-9.
For 100eV would i just multiply 100 by 1.6x10^-19? then plug it back into the equation?
 
That should work.

Did you really mean to use p=(Em)1/2 or is that a typo -- there is a missing number in the expression?
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
2
Views
3K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 4 ·
Replies
4
Views
2K