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The first four energy levels for an atom are: E1 = -8.57 eV   E2 = -2.14...

The first four energy levels for an atom are:

E1 = -8.57 eV   E2 = -2.14 eV   E3 = -0.95 eV E4 = -0.54 eV

An electron with a kinetic energy of 7.74 eV collides with an electron in its ground state. After the collision, the atom is in an excited state and the electron is scattered. The kinetic energy of the scattered electron could be

I have been struggling with this question, help asap would be highly appreciated. Thank you :)))

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