Question

this energy diagram shows the allowed energy levels of an electron in a certain atom. (note: the si prefix zepto means ( 10^{-21} ). you can find the meaning of any si prefix in the aleks data tab.)
use this diagram to complete the table below.
what is the energy of the electron in the ground state? ( square zj )
what is the energy of the electron in the first excited state? ( square zj )
if the electron makes the transition shown by the red arrow, from c to b, will a photon be absorbed or emitted? absorbed emitted

Explanation:

Step1: Determine the ground - state energy

The ground state is the lowest energy level. Looking at the diagram, the lowest energy level (labeled A) has an energy of \(400\space zJ\).

Step2: Determine the first - excited state energy

The first excited state is the next higher energy level. The level labeled B is the first excited state. From the diagram, its energy is \(900\space zJ\).

Step3: Analyze the photon transition

When an electron transitions from a higher energy level (C) to a lower energy level (B), it loses energy. This energy is released in the form of a photon. So, a photon is emitted.

Answer:

Question	Answer
What is the energy of the electron in the first excited state?	\(900\space zJ\)
If the electron makes the transition shown by the red arrow, from C to B, will a photon be absorbed or emitted?	emitted