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

Calculate the recoil energy and velocity of a hydrogen atom in a transition from n=4 to n=1 in which a photon is emitted

2. Relevant equations

I started with calculating the energy of the emitten photon.

[tex] E_{photon}= \frac{-16.6 eV}{n^2}-\frac{-13.6 eV}{n^2}=\frac{-13.6}{16}+13.6= 12.75 eV[/tex]

3. The attempt at a solution

having calculated the energy of the emitted photon i can calculate its momentum

[tex] p= \frac{E_{photon}}{c}=\frac{2.04\cdot10^{-18}}{3\cdot10^8}=6.81\cdot10^{-27}\frac{kg\cdot m}{s}[/tex]

1. The problem statement, all variables and given/known data

can this be relevant? can the emitted photons momentum be so small??? how to solve this problem?

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# Homework Help: Recoil energy and velocity

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