Question

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

Answer 1

the energy of n = 4.00 in Part A. Now find the energy of the ground state. Then subtract the two energies:
ΔE=Efinal−Einitial

Answer 2

-3J?

Answer 3

@SmokeyBrown

Answer 4

She answered her own question? WOah. XD

Answer 5

She put what she thought may be the answer, Howie

Answer 6

Its not right

Answer 7

I don't know what I'm doing wrong, @Vocaloid

Answer 8

Hm. As far as I remember the ground state electron energy is -13.6eV which is -2.179e-18J

So whatever the energy was at n = 4, just subtract -2.179e-18J?

Answer 9

Again idk about the sign convention here

Answer 10

So 4-( -2.179e-18J)= 4x10^0 J ?

Answer 11

oh, no, 4 is the energy level, not the energy

so you would need to calculate the nrg level at n = 4 using the rydberg equation then subtract the ground level nrg

Answer 12

is the rydberg equation : En==rhc/n^2

Answer 13

Just confused as to which equation it is

Answer 14

yeah that should be the one

Answer 15

En==(1.097x10^7)(6.626x10^-34)(2.998x10^8)/4^2
=1.362x10^-19J

Answer 16

good, then repeat the process w/ n = 1 and then subtract the two energies

Answer 17

okay so do I subtract the n=4 energy from the n=1 or vice versa

Answer 18

final minus initial

so n = 1 state minus n = 4 state

Answer 19

oh okay 2.043 x 10^-18

Answer 20

J

Answer 21

I'm a little fuzzy on the sign convention but since it's dropping from a higher nrg level to a lower one it should be decreasing in energy

I'd use the negative energy change

Answer 22

okay and 4 sig figs right

Answer 23

depends on what you gave for part A

Answer 24

3?

Answer 25

i gave 1.37

Answer 26

yeah then stay consistent with 3 sig figs

Answer 27

that was the answee for part a

Answer 28

okay

Answer 29

its showing up as wrong

Answer 30

did you give the + or - energy change

Answer 31

both

Answer 32

i tried with both

Answer 33

hm

I can probably ask someone else for a second opinion because all i'm getting is 2e-18J

Answer 34

oh duh, I forgot to put the e-18

Answer 35

we got it right thanks