Physics, 04.07.2019 23:00, jjbossgt

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?

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answered: TaraC

What it looks to be that you found in A was the "initial"...b/c the question asks:
"how much energy does the electron have 'initially' in the n=4 excited state?"

"final" would be where it 'finally' ends up at, ie. its last stop...as for this question...the 'ground state' as in its lowest energy level.

The answer comes to: −1.36×10^−19 J

You use the same equation for the second part as for part a.
just have to subract the 2 as in the only diff for part 2 is that you use 1squared rather than 4squared & subract "final -initial" & you should get -2.05*10^-18 as your answer.

answered: lisagrimmett3

Energy the electron have initially $E_4=-0.85 \rm ev$ ,

The change in energy if the electron from part a now drops to the ground state is $12.75\rm ev$

Explanation:

Given information:

Electron have initially in the n=4 excited state,

We know,

Energy of an electron is given by,

$E_n=-13.6\rm ev\times\frac{z^2}{n^2}$

On substituting n=4 for excited state energy,

$E=-13.6\rm ev\times\frac{1^2}{4^2}=-0.85\rm ev$

Change in energy from excited state to ground state,

For ground state n=1,

$E=-13.6\rm ev\times z^2\times( \frac{1}{(n_2)^2}-\frac{1}{(n_1)^2})$

On substituting n_1=1 , n_2=4 ,

$\Delta E=E_4-E_1=-13.6\rm ev\times 1^2\times( \frac{1}{(4)^2}-\frac{1}{(1)^2})=12.75ev$

Hence, energy the electron have initially $E_4=-0.85 \rm ev$ ,

NOTE:- $1\rm ev=-1.602\times 10^{-19}joule$

Energy the electron have initially $E_4=-0.85 \rm ev$ ,

The change in energy if the electron from part a now drops to the ground state is $12.75\rm ev$

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answered: Guest

explanation:

newton's third law, for every action there is an equal and opposite reaction.

answered: Guest

An atom (ours, not carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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How much energy does the electron have initially in the n=4 excited state? what is the change in ene...