InterviewSolution
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InterviewSolution
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An electron is accelerated through a potential difference V. Write the expression for its final speed , if it was initially at rest. |
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Answer» According to work energy theorem , work done is equal to change in kinetic energy. So , `{:(W=K_(f)-K_("i"),,W=(1)/(2)mv^(2)-(1)/(2)m u^(2)),(V=(W)/(q)=(W)/(e),rArr,W=eVandu=0),(eV=(1)/(2)mv^(2),,v^(2)=(2eV)/(m)),(v=sqrt((2eV)/(m)),,):}` |
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