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25_speed

# 25_speed - Lesson 25 Speed of Light Over hundreds of years...

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Lesson 25: Speed of Light Over hundreds of years, physicists have tried to measure the speed of light. This is not an easy task, since it travels so fast that it can cover large distances almost instantly. Many of the scientists who tried failed, but with each attempt we learned more and more about how we might be able to do it. Galileo Galileo performed his own experiment to see if he could measure the speed of light. Galileo stood on one hilltop while another person stood on another, both holding covered lanterns. Galileo opened his lantern first. As soon as his assistant saw the light from Galileo, the assistant opened his to shine a light back. Galileo hoped that by knowing the distance between the two hilltops and the time it took for the light to travel between them he would be able to calculate the speed of light. In the end, Galileo realized that the small time difference he measured was probably due to human reaction time and his poor methods to measure time. Galileo still believed that the speed of light would someday be measured, just not using his method. Ole R ø mer About 75 years later a Danish astronomer named Ole Rømer did a pretty good job of measuring the speed of light based on the eclipse of one of Jupiter’s moons. At certain times, Earth and Jupiter are closer to each other in their orbits… sometimes they are further apart. Rømer had noticed that at some times there was a delay in the time he could see Jupiter eclipse one of its moons.

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25_speed - Lesson 25 Speed of Light Over hundreds of years...

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