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Galileo's attempts to measure the speed of light with lanterns

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Galileo attempted to measure the speed of light by measuring the time elapsed between his opening a lantern and his seeing the return light from his assistant's lantern...
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Solution Summary

The speed of light is calculated using Galileo experiment is determined. The time elapsed between his opening a lantern and his seeing the return light from his assistant's lanterns are determined.

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Please see the attachment.

I don't know how to calculate the distance/time for the problem. I know that there should be some consideration for the human reaction time, but I don't know how it factors in.

Answer:

Let the speed of light is c, then the actual time taken by the light to travel the distance is t ...

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