Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 27 - Early Quantum Theory and Models of the Atom - Problems - Page 800: 54

Answer

$1.09707\times10^7 \;\rm m^{-1}$

Work Step by Step

As the author told us, to evaluate the Rydberg constant $R$ by using the Bohr model we will use the two formulas of $$\dfrac{1}{\lambda}=R\left(\dfrac{1}{n'^2}-\dfrac{1}{n^2}\right)$$ and $$\dfrac{1}{\lambda}=\dfrac{2\pi^2Z^2e^4mk^2}{h^3c}\left(\dfrac{1}{n'^2}-\dfrac{1}{n^2}\right)$$ Therefore, $$R=\dfrac{2\pi^2Z^2e^4mk^2}{h^3c}$$ we know that $k=\dfrac{1}{4\pi \varepsilon_0}$; so $$R=\dfrac{2\pi^2Z^2e^4m }{h^3c (4\pi \varepsilon_0)^2}=\dfrac{2\pi^2Z^2e^4m }{16h^3c \pi^2 \varepsilon_0 ^2}$$ $$R =\dfrac{ Z^2e^4m }{8 h^3c \varepsilon_0 ^2}$$ For the Hydrogen atom, $Z=1$; $$R =\dfrac{ e^4m }{8 h^3c \varepsilon_0 ^2}$$ Plugging the known; $$R =\dfrac{ (1.602176 \times10^{-19})^4\cdot (9.109382\times10^{-31}) }{8\cdot (6.626069 \times10^{-34})^3\cdot (2.997925\times10^8) \cdot (8.8554188 \times10^{-12})^2}$$ $$R =\color{red}{\bf 1.09707\times10^7}\;\rm m^{-1}$$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.