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what is the wavelength of light emitted when an electron in the hydrogen atom undergoes a transition from n=4 to n=2

Submitted by JSinfelt on Sun, 03/03/2013 - 13:56

How do you solve this equation?

You need the Rydberg equation. Type Rydberg equation into Google eg Wikipedia gives

\frac{1}{\lambda_{\mathrm{vac}}} = R\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)


\lambda_{\mathrm{vac}} \! is the wavelength of electromagnetic radiation emitted in vacuum,
R\! is the Rydberg constant, approximately 1.097 * 107 m-1,
n_1\! and n_2\! are integers greater than or equal to 1 such that n_1 < n_2\! and .

How do you solve? what numbers go where?