When an electron moves through a medium at a speed exceeding the speed of light in that medium, it radiates electromagnetic waves (the Cerenkov effect). We have to find the minimum speed that an electron must have in a liquid of index of refraction 1.54 in order to radiate.
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Solution: Click For PDF Version The speed of electromagnetic waves in a medium of index of refraction n is given in terms of the speed of electromagnetic waves in vacuum, c, as
The minimum speed that an electron must have in a liquid of index of refraction 1.54 in order to radiate will be
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