Why Choose Both Electron and Hydrogen Atom as a System in Collision Studies?

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SUMMARY

In collision studies involving an electron and a hydrogen atom, selecting both as the system is essential due to the conservation of momentum and energy principles. The correct reasoning is that the forces between the two objects are internal, thus not affecting the total momentum of the system (Option B). Additionally, external forces are negligible during the collision, allowing for accurate analysis of the system's dynamics. This understanding is crucial for accurate modeling in quantum mechanics and particle physics.

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Loppyfoot
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Which of the following...

Homework Statement



In a collision between an electron and a hydrogen atom, it is useful to select both objects as the system because:

A. The total momentum of the system does not change during the collision
B. The forces the objects exert on each other are internal to the system and don't change the total momentum of the system
C. During the time interval just before to just after the collision, external forces are negligible
D. The kinetic energy of a two-object system is nearly zero
E. The sum of the final kinetic energies must equal the sum of the initial kinetic energies for a two-object system



I am confused about this one. any ideas?
 
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I would say A.
 

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