Electrons in excited hydrogen atoms are in the
n = 3 energy level. how many different photon
frequencies could be emitted as the atoms return
to the ground state?
(1) 1 (3) 3
(2) 2 (4) 4

Choice 3

Explanation: In returning to the ground state from the n=3 level, the electron could jump to the n=1 directly; alternatively, it could jump to the n=2 then jump to n=1 level. Each jump represents a photon at a different energy level. Therefore, three different photon frequencies could be emitted.

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the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it