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unscientific
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Homework Statement
This is from "Special Relativity" by A.P. French. Chapter 1.
"An electron is moving with speed 0.5c in the x direction enters a region of space where there is a uniform electric field in the y direction. Show that the x component of the velocity of the particle must decrease. "
The Attempt at a Solution
1. Is it because there is acceleration in the y-direction, the electron will emit radiation, hence losing energy/mass? But what has this got to do with relativity?