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# chem help?

A hydrogen atom in the ground state absorbs a photon of wavelength 93.8 nm.

What energy level does the electron reach?

This excited atom then emits a photon of wavelength 7458.9 nm.

What energy level does the electron fall to?

### 1 Answer

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- Dr WLv 74 weeks ago
from the rydberg equation

.. 1/L = Rh * (1/n1² - 1/n2²)

.. 1/n2² = 1/n1² - 1/L * (1/Rh)

.. 1/n2² = 1/1² - 1/(93.8x10^-9m) * 1/(1.097x10^7/m)

.. n2 = 6

then..

.. 1/L = Rh * (1/n1² - 1/n2²)

.. 1/n1² = 1/6² + 1/(7458.9x10^-9m) * 1/(1.097x10^7/m)

.. n1 = 5

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