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Frank and Ernest by Thaves for July 30, 2022
July 29, 2022
July 31, 2022
In a way, it is kind of a trick question, because the most common answer (300,000 km/s) assumes that the phrase “in a vacuum” accompanies the question. The reason prisms diffract light into different colors is because some of the light waves go more slowly thru a solid medium than thru empty space.