
This exercise provides several simulations depicting the flow of photons
through a hot atomic gas, and the transport of energy in the form of
photons from the center of the Sun to the surface.  Begin by selecting
"Log In" on the main menu, and fill in the requested information.  When
you have completed the log in, select "Simulation" to access the various
components of the exercise.  You should select and perform the
simulations in the order that they appear on the menu (top to bottom).
A check mark will appear by each simulation you have selected.

The simulations are as follows:

    Interaction - Close up simulations of the interactions between a
    photon and individual atoms.  Photons are selected as either "Line"
    or "Continuum", relative to the atoms of the gas.

    Flow - Simulations of the movement of photons from the center of the
    Sun (where they are created by nuclear fusion reactions) to the
    surface, where they escape as light or heat.  Two specific
    simulations are selected from a sub-menu as follows:

        1 Photon - Depicts the path of a single photon from the center
        to the surface of the Sun.
  
        Diffusion - Initiates a pulse of photons at the center of the
        Sun to illustrate diffusion as they travel individually to the
        surface.

    Emission - Simulates the travel of line photons through a gas in a
    laboratory setting.
 
    Continuum - Simulates the travel of continuum photons through a gas
    in a laboratory setting.

    Experiment - Illustrates the generation of an absorption line
    spectrum by passing photons covering a range of energies through
    a selected atomic gas.

A Help selection is provided with each simulation window.  Select it to
obtain specfic information on running the simulation.



