Determining Neutron Wavelength with mass alone

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SUMMARY

The discussion focuses on determining the wavelength of a neutron with a mass of approximately 1000 MeV/c² in a gravitational potential defined by V(z) = mgz for z > 0. The relationship between momentum and wavelength is established using the equations p = (2m(E - mgz))^(1/2) and λ = h/p. The conclusion drawn is that the wavelength of the neutron is on the order of 10 micrometers (10 µm), which is derived by resolving the factors of gravitational acceleration (g) and height (z) in the context of the potential energy. Suggestions include visualizing the potential and ground-state wave function to better understand the relationship between wavelength and energy.

PREREQUISITES
  • Understanding of quantum mechanics, specifically wave-particle duality.
  • Familiarity with the concepts of potential energy in gravitational fields.
  • Knowledge of the de Broglie wavelength formula and its application.
  • Basic proficiency in manipulating units of energy (MeV) and mass (MeV/c²).
NEXT STEPS
  • Explore the de Broglie wavelength derivation in quantum mechanics.
  • Study gravitational potential energy and its implications in quantum systems.
  • Learn about the Schrödinger equation and its application to particles in potential wells.
  • Investigate the relationship between energy levels and wave functions in quantum mechanics.
USEFUL FOR

Students and professionals in physics, particularly those studying quantum mechanics and gravitational effects on particle behavior, will benefit from this discussion.

atomicpedals
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Homework Statement



Consider a particle of mass m in the potential

V(z)=mgz z>0, infinity if z<0

Show that the wavelength of a neutron (m~1000MeV/c^2) is on the order of 10um.

Homework Equations



p=(2m(E-mgz))1/2
\lambda=h/p

The Attempt at a Solution



The most direct solution would seem to simply be

h/(2m(E-mgz))1/2 (with appropriate substitutions)

however, that still leaves the factors of g and z to be resolved... I could take z as 1, but there's still g with a units problem (m/s/s vs MeV and MeV/c^2).

Any suggestions?
 
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Try drawing a diagram of the potential and then sketch what the ground-state wave function will look like. That should give you an idea for a relationship between the wavelength and the energy of the neutron.
 
So, for z>0 the potential will increase linearly (holding m and g constant).
 

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