What Happens When Photons Interact with Hydrogen Atoms?

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Homework Help Overview

The discussion revolves around the interaction of photons with hydrogen atoms, specifically focusing on energy levels and the kinetic energy of electrons resulting from photon bombardment. The original poster presents a scenario involving a hydrogen atom with defined energy levels and an incoming photon energy of 15 eV.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss calculating the incoming photon frequency using the energy equation E=hf and converting energy units from eV to Joules. There are inquiries about the possible kinetic energies and speeds of electrons after interaction with the photon, as well as the maximum kinetic energy that can be achieved.

Discussion Status

Some guidance has been offered regarding the conversion of energy units and the calculation of energy levels for the hydrogen atom. Participants are exploring the implications of photon energy on electron ionization and kinetic energy without reaching a consensus on specific values or methods.

Contextual Notes

There is a note about the original poster's unfamiliarity with the forum's structure, indicating a potential lack of clarity on where to post homework-related questions. The discussion is framed within the context of homework help, suggesting constraints on the type of assistance that can be provided.

jezse
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please help me study by answering a few questions.

consider a hydrogen atom with energy levels En= -(13 eV)/(n^2)

this atom is bombarded by photons of E = 15 eV.

What is the incoming photon frequency?

What are possible kinetic energies and speeds of the emerging electrons?

What is the maximun kinetic energy the electon can have?

I'd appreciate any help.
 
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Originally posted by jezse
please help me study by answering a few questions.

consider a hydrogen atom with energy levels En= -(13 eV)/(n^2)

this atom is bombarded by photons of E = 15 eV.

What is the incoming photon frequency?

What are possible kinetic energies and speeds of the emerging electrons?

What is the maximun kinetic energy the electon can have?

I'd appreciate any help.

This sounds like it should be in the HWK section...

Anyway, convert 15eV into Joules and then use E=hf to calculate the frequency. Then for n=1,2, 3 etc calculate the energy levels of the Hydrogen atom (stick with Joules, not eV as it may help later).
For levels of less energy than our 15eV photon has, the electron will be ionised by the photon. The difference in energy between the photon energy and the energy level gives the KE of the emerging electron. Use 1/2mv^2 to calculate the velocities.
 
sorry new to the board, didn't realize there was a HW section. thanks for your help.
 
No problem! :smile:

And welcome to the Physics Forum.
 

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