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Also, here’s the simulation of an eclipsing binary that I used (one to demonstrate the effect, and one to use in the practical) and the worksheet I gave my pupils when I did it with them.  The worksheet is written for measuring the changing resistance, but I’ve also done it with a cell in the circuit, and measured the changing current, which drops during the eclipse, just as the light curve does, whearas the resistance increases, which may wrong-foot some pupils.

Richard

1310120323eclipsing binaries simulation.ppt

1310120339eclipsing binaries for experiment.ppt

1310120355detecting binary stars.doc

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