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The velocity of electrons in cathode ray...

The velocity of electrons in cathode rays is 0.1c where c is the velocity of light. However, when they are accelerated through a potential difference of 20,000 V, their velocity is found to be `8.4 xx 10^(7)ms^(-1)`. What is the percentage increase in the kinetic energy of electrons ? (Take `c = 3 xx 10^(8) ms^(-1)`)

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