Finding wavelength of an electron

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SUMMARY

The wavelength of an electron with a kinetic energy of 2.00 MeV and 2.08 GeV can be calculated using the equation λ = hc / (2(mc²)K)^(1/2). However, this equation is only valid for non-relativistic electrons. Since the kinetic energies provided exceed the rest energy of the electron (511.0 keV), the relativistic effects must be considered for accurate calculations. The correct approach involves using relativistic equations to determine the wavelength accurately.

PREREQUISITES
  • Understanding of de Broglie wavelength
  • Familiarity with relativistic physics
  • Knowledge of kinetic energy and rest energy concepts
  • Proficiency in unit conversions (eV to MeV and GeV)
NEXT STEPS
  • Learn about relativistic momentum and energy equations
  • Study the derivation of the de Broglie wavelength for relativistic particles
  • Explore the implications of relativistic effects on particle behavior
  • Practice calculations involving kinetic energy and wavelength for high-energy electrons
USEFUL FOR

Physics students, educators, and professionals working in quantum mechanics or particle physics who need to understand the behavior of electrons at high kinetic energies.

kraigandrews
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Homework Statement


What is the wavelength of an electron with a kinetic energy of 2.00 MeV?

What is the wavelength of an electron with a kinetic energy of 2.08 GeV?

(Possibly useful constants: hc = 1239.8 eVnm, rest energy of the electron: E0,e = 511.0 keV.)


Homework Equations


[itex]\lambda[/itex]=hc/(2(mc2)K)1/2



The Attempt at a Solution


Should be pretty straightforward, I keep getting the wrong answer though, should just be plug and chug, i would think.
 
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Are you sure that's a correct equation for the de Broglie wavelength? I've never seen it written that way, though I guess the units do check out...Making sure to put everything in the same units?

I did a rough calculation and you're right, the answers don't seem realistic.
 
Last edited:
Your equation for the wavelength is for a non-relativistic electron. Those kinetic energies, however, are greater than the rest energy of the electron, so you're in the relativistic regime.
 

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