How much energy does the electron have initially in the n=4 excited state? what is the change in energy if the electron from part a now drops to the ground state?

Energy  the electron have initially ,

The change in energy if the electron from part a now drops to the ground state is

Explanation:

Given information:

Electron have initially in the n=4 excited state,

We know,

Energy of an electron is given by,

On substituting n=4 for excited state energy,

Change in energy from excited state to ground state,

For ground state n=1,

On substituting ,,

Hence, energy  the electron have initially ,

NOTE:-

Energy  the electron have initially ,

The change in energy if the electron from part a now drops to the ground state is

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it takes about 30 days for it to break down

gas and liquid