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AP® Physics 1 & 2

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Moderate

Possible Energy

APPH12-IJSCY9

An electron is currently sitting in the ground state with -14 energy units. The first excited state has -7 energy units. The second excited state has -4 energy units and the third excited state has -1 energy units. Which of the following is possible for this electron?

A

A photon of 7 energy units is emitted.

B

A photon of 10 energy units is emitted.

C

A photon of 7 energy units is absorbed.

D

A photon of 9 energy units is absorbed.