We’re being asked to calculate the frequency (Hz) of a photon released when a hydrogen atom undergoes a transition from an excited state.

Frequency can be calculated from wavelength and the speed of light:

$\overline{){\mathbf{c}}{\mathbf{=}}{\mathbf{\lambda \nu}}}\phantom{\rule{0ex}{0ex}}\frac{\mathbf{c}}{\mathbf{\lambda}}\mathbf{=}\frac{\overline{)\mathbf{\lambda}}\mathbf{\nu}}{\overline{)\mathbf{\lambda}}}\phantom{\rule{0ex}{0ex}}\overline{){\mathbf{\nu}}{\mathbf{=}}\frac{\mathbf{c}}{\mathbf{\lambda}}}$

We’re going to use the **Balmer Equation** to calculate the wavelength which relates wavelengths to a photon’s electronic transitions.

What is the frequency in Hz of the photon released when a hydrogen atom undergoes a transition from the excited state where n = 2 to the state where n = 1?

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Our tutors have indicated that to solve this problem you will need to apply the Bohr and Balmer Equations concept. If you need more Bohr and Balmer Equations practice, you can also practice Bohr and Balmer Equations practice problems.

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Based on our data, we think this problem is relevant for Professor Hempstead's class at York University.