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HW 13 Question 10 & 11

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A monochromatic beam of light is absorbed by a collection of ground-state hydrogen atoms in such a way that three different wavelengths are observed when the hydrogen relaxes back to the ground state.

 

How do go about starting this question?

For question 11,

A photon with energy 2.43 eV is absorbed by a hydrogen atom.

(a) Find the minimum n for a hydrogen atom that can be ionized by such a photon.
 

(b) Find the speed of the electron released from the state in part (a) when it is far from the nucleus.

How do we find the velocity of the electron?

asked Dec 9, 2014 in Intro College Physics by anonymous

1 Answer

0 votes
For Q 10, the electrons are excited in to n=3 state so that when they back to n=1, there are 3 possible combinations of transitions. Then you can figure out the different ones.

For Q11

See which energy state is >= than -2.43 eV -- electrons on this level can be set free by absorbing the photon.

After released from the atom, the electron will have some left over KE which allows you to find the speed.
answered Dec 10, 2014 by PhysicsDude (21,750 points)
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