Question

Electrons are caused to fall through a potential difference of 1500 volts. If they were initially at rest , their final speed is
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Answer 1

The electrical potential energy is converted into kinetic energy. If v is the final speed then

$\frac{1}{2}mv^{2} = eV$

$v = \sqrt{\frac{2eV}{m} }$

$v = \sqrt{\frac{2 * 1.6 * 1500 * 10^{-19} }{9.1*10^{-19}} }$

$v = 2.3 * 10^{7} ms^{-1}$

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