(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A hydrogen atom in the n = 2 state absorbs a photon with wavelength 380 nm.

Q1. Find the change in the atom’s total energy.

Q2. Find the change in the atom’s potential energy

Q3. Find the change in the orbiting electron’s kinetic energy.

2. Relevant equations

E=E_{0}/n^{2}

3. The attempt at a solution

Q1 I solved correctly so I know total E = 5.23×10^{−19}J

Q2 I know U = E - K, but I don't know the formulas for K or for U so I'm stuck here for Q2 and Q3.

Direction please? Also, I'm having difficulty in understanding why the kinetic energy of the electron decreases as you move away from the nucleus, and why the potential energy increases. Thanks.

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# Homework Help: Potential/Kinetic/Total Energy of hydrogen atom absorbing photon

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