**Part A. **We are being asked to determine the amount of energy the electron initially have in the n=4 excited state.

Recall the equation:

$\overline{){{\mathbf{E}}}_{{\mathbf{n}}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{-}\mathbf{2}\mathbf{.}\mathbf{18}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{18}}\mathbf{}{\displaystyle \raisebox{1ex}{$\mathbf{J}$}\!\left/ \!\raisebox{-1ex}{$\mathbf{photon}$}\right.}}{{\mathbf{n}}^{\mathbf{2}}}}$

PART A:

How much energy does the electron have initially in the *n*=4 excited state?

PART B:

What is the change in energy if the electron from Part A now drops to the ground state?

PART C:

What is the wavelength of the photon that has been released in Part B?

Express your answer numerically in meters.

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What scientific concept do you need to know in order to solve this problem?

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