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The energy-level diagram for a theoretical atom is shown below.

A sample of gas made up of these atoms is initially in the ground state, when the sample is bombarded with a beam of electrons. Each electron in the beam is moving with $7.0\text{ eV}$ of kinetic energy.

Which of the following express how many different frequencies of light are found in the emission spectrum of the atoms, when they are allowed to fall back to the ground state?

A

$1$

B

$2$

C

$3$

D

No light would be emitted in this situation.

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