The allowed energies of a simple atom are 00 ev 50 ev and, Ask an Expert

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The allowed energies of a simple atom are 0.0 eV, 5.0 eV and 8.0 eV. An electron traveling at a speed of 1.8×10^6 m/s collisionally excites the atom.

What is the minimum speed the electron could have after the collision?

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