# Electron energy levels in Bohr modelWatch

Thread starter 5 years ago
#1
At the bottom of this linked-to screen below is an equation for E = - .......... = - ............. = - 13.6 Z^2 / n^2 eV

https://en.wikipedia.org/wiki/Bohr_m..._energy_levels

I'm using the following values for the formula

Z=1
n=1
K sub e = 8.987 x 10^9 (Coulombs constant)
e = 2.71828
m sub e = 9.11 x 10^-31 (mass of electron)
h-bar = 1.05 x 10^-34

But when I plug these values in I get (4.017x10^-9) / (2.205 x 10^-68) = - 1.82 x 10^59

and not -13.6 eV

What am I doing wrong? Are any of my values above incorrect?
0
5 years ago
#2
(Original post by little pixie)
At the bottom of this linked-to screen below is an equation for E = - .......... = - ............. = - 13.6 Z^2 / n^2 eV

https://en.wikipedia.org/wiki/Bohr_m..._energy_levels

I'm using the following values for the formula

Z=1
n=1
K sub e = 8.987 x 10^9 (Coulombs constant)
e = 2.71828
m sub e = 9.11 x 10^-31 (mass of electron)
h-bar = 1.05 x 10^-34

But when I plug these values in I get (4.017x10^-9) / (2.205 x 10^-68) = - 1.82 x 10^59

and not -13.6 eV

What am I doing wrong? Are any of my values above incorrect?
e = 2.71828???????

e is the charge on the electron.
0
Thread starter 5 years ago
#3
Thanks Stonebridge; I'd thought it was the exponential function.
0
Thread starter 5 years ago
#4
I'm trying to write a simple Excel program to allow use of that formula.

I've included my program and the formula in the Excel attachment. Would anyone know why I'm getting the VALUE! message in the A5 box?
0
5 years ago
#5
(Original post by little pixie)
I'm trying to write a simple Excel program to allow use of that formula.

I've included my program and the formula in the Excel attachment. Would anyone know why I'm getting the VALUE! message in the A5 box?
You need to type an = sign in a cell before expressions.
0
Thread starter 5 years ago
#6
(Original post by Stonebridge)
You need to type an = sign in a cell before expressions.
Thanks again Stonebridge!
0
Thread starter 5 years ago
#7
I've attached the updated Excel file again.

The cell A5 displays the value in eV, currently set for n=1.

If I want to obtain the different values of Energy but for each of the values of n between 1 and 10 inclusive, how would I do this?
0
X

new posts Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• Regent's University London
Thu, 19 Sep '19
• Durham University
Pre-Application Open Days Undergraduate
Fri, 20 Sep '19
• Loughborough University
Fri, 20 Sep '19

### Poll

Join the discussion

Rock (115)
24.78%
Pop (108)
23.28%
Jazz (20)
4.31%
Classical (23)
4.96%
Hip-Hop (87)
18.75%
Electronic (37)
7.97%
Indie (74)
15.95%