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a) If the 3rd energy level of a hypothetical hydrogen-like atom is −1.50×10−18 J, what is...

a) If the 3rd energy level of a hypothetical hydrogen-like atom is −1.50×10−18 J, what is the energy of the 2nd energy level?

b) If a photon whose frequency is 2.50×1016 Hz collides with an electron at rest and loses 25.0% of its energy, what is the speed of this electron after collision?

c) An electron of a hydrogen atom is on its 4th energy orbit. How many possible photons it could emit?

     a)3

     b)4

     c)5

     d)6

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