The allowed energies of a simple atom are (0.0 mathrm{eV}, 4.0 mathrm{eV}), and (6.0 mathrm{eV}). An electron

Question:

The allowed energies of a simple atom are $0.0 \mathrm{eV}, 4.0 \mathrm{eV}$, and $6.0 \mathrm{eV}$. An electron traveling at a speed of $1.6 \times 10^{6} \mathrm{~m} / \mathrm{s}$ collisionally excites the atom. What are the minimum and maximum speeds the electron could have after the collision?

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