# Electron energy levels in Bohr modelWatch

#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
#3
Thanks Stonebridge; I'd thought it was the exponential function.
0
#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
#6
(Original post by Stonebridge)
You need to type an = sign in a cell before expressions.
Thanks again Stonebridge!
0
#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
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