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Author Topic: Atomic Spectra of Hydrogen and red shift  (Read 3961 times)
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on: May 15, 2010, 12:38:12 am »

This following applet is Atomic Spectra of Hydrogen and red shift
Created by prof Hwang modified by Ahmed
Original project Atomic Spectra of Hydrogen and red shift

This applet let you play with atomic spectra of hydrogen.

The wavelengths of hydrogen spectra lines can be described by the following equation:

where RH=1.0973732*107 m-1

You can change n1 with the slider bar. The program will plot a series of spectrum lines.
You might want to change the xmax(at the right) to see the full range of the spectra.
One of the line is thicker and with an arrow is the one with n2 equal to slider bar value.

Click within simulation region will toggle "visible spectra range".

You can also find out how the red shift of the spectra calculated from Hubble's law.
v=H0 D where the recessional velocity is proportional to the distance of the star to the earth (D). You can adjust the distance of the star.
And see the red shift of the hydrogen spectra from that star due to the expansion of the universe.
n1=1 : Lyman series (Ultraviolet)
n1=2 : Balmer series (Near Ultraviolet and Visible)
n1=3 : Paschen series (Infrared)
n1=4 : Brackett series (Infrared)
n1=5 : Pund series (Infrared)

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
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Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

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Wisdom consists of the anticipation of consequences. ..."Norman Cousins(1913-1990, American author)"
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