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Electrons are accelerated through a potential difference of 940 kV, so that their kinetic energy is...

Electrons are accelerated through a potential difference of 940 kV, so that their kinetic energy is 9.40×105 eV.

A) What is the ratio of the speed v of an electron having this energy to the speed of light, c?

B) What would the speed be if it were computed from the principles of classical mechanics?

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