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Question

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


A
4.6×107m/s
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B
0.726×107m/s
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C
0.23×102m/s
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D
5.1×109m/s
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Solution

The correct option is B 0.726×107m/s
V = 1500 V
u = 0, initial K.E = 0
Energy last by electron = V.e=1500×1.602×1019
2.403×1019joules
massofelectrons(m)=9.1×1031kgkineticenergygained=P.Elost12mV2=2.403×1017V2=2×2.403×10179.1×1031=4.806×10+149.1=0.528×1014V20.528×1014=0.726×107m/s

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