Calculating Kinetic Energy of Recoiling Hydrogen Atom

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SUMMARY

The discussion focuses on calculating the recoil kinetic energy of a hydrogen atom emitting Lyman radiation and determining the fraction of excitation energy from the n = 2 state carried by the recoiling atom. The relevant equation for energy is E = -13.6/n² eV, which defines the energy levels of the hydrogen atom. By applying the conservation of momentum, participants conclude that the recoiling atom's kinetic energy is directly related to the momentum of the emitted photon.

PREREQUISITES
  • Understanding of quantum mechanics, specifically atomic energy levels
  • Familiarity with the concept of momentum conservation
  • Knowledge of Lyman series transitions in hydrogen
  • Basic proficiency in calculating kinetic energy
NEXT STEPS
  • Study the conservation of momentum in quantum systems
  • Learn about the Lyman series and its significance in atomic physics
  • Explore kinetic energy calculations for particles in quantum mechanics
  • Investigate the implications of photon emission on atomic motion
USEFUL FOR

Students of physics, particularly those studying atomic and quantum mechanics, as well as educators looking for practical examples of momentum conservation in atomic transitions.

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Homework Statement


A hydrogen atom at rest in the laboratory emits the Lyman radiation.
(a) Compute the recoil kinetic energy of the atom.
(b) What fraction of the excitation energy of the n = 2 state is carried by the recoiling atom? (Hint: Use conservation of momentum.)

Homework Equations


E=-13.6/n^{2}ev


The Attempt at a Solution


I'm not sure if this equation is relevant, but I'm not sure what they are referring to when they say recoil kinetic energy of the atom.
 
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(Hint: Use conservation of momentum.) The departing photon carries momentum. The atom must have an equal and opposite momentum (hence a nonzero kinetic energy). The total energy of the two is the Lyman transition energy.
 

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