Speed of the electron after the collision

AI Thread Summary
The discussion centers on calculating the speed of an electron after it collides with an atom, initially traveling at 5.50×10^6 m/s. The collision excites the atom from its ground state to an energy level of 3.50 eV. To find the electron's final speed, the conservation of energy principle is applied, where the initial kinetic energy of the electron equals the sum of its final kinetic energy and the energy transferred to the atom. The initial kinetic energy of the electron is calculated, and the energy transferred to the atom is subtracted to determine the final kinetic energy. This approach allows for the calculation of the electron's speed post-collision.
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An electron with a speed of 5.50×10^6 m/s, collides with an atom. The collision excites the atom from its ground state (0eV) to a state with an energy of 3.50eV


What is the speed of the electron after the collision?


Dont know where to start.
 
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Well how much of the initial energy of the electron is transferred to the atom to cause the excitation?
 
Conservation of Energy:

KE_e_i = KE_{e_{f}} + E_{atom} assuming that the atom is initially at rest.
 

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