Equation for the Bohr Model
(Go to page 220 of you text before you read this!)
On your data sheet, we will be giving you the Rydberg constant as R
H
=2.18
×
10
−
18
J.
Your book uses a different convention and value for the same constant.
Equation 6.7 in your book is the form of the equation for the Bohr Model that I used in
class, in my lecture notes, and the form that is given on your data sheet. The Rydberg
equation (at the bottom of page 221) differs from this by some simple algebra. The value
of R
H
as given in your text is 1.097
×
10
7
m
−
1
( =2.18
×
10
−
18
J divided by h c ; Plancks’
constant times the speed of light). Note: the value of the constant (and the UNITS) are
different, but the two constants are proportional.
So why ARE there two different forms for this same equation and why are putting the
∆
E
form of the equation on your data sheet rather than the 1/
λ
version?
The equation given at the bottom of page 221 would be a useful form for spectroscopists
(people who study spectroscopy or how light is emitted and absorbed by matter). The
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 Spring '08
 HOFMANN,BRUCEROB
 Chemistry, Light, Electric charge, Fundamental physics concepts

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