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Question
Find the speed of an electron with kinetic energy 1 eV
A
$50.92×10_{5}ms_{−1}$
B
$589.92×10_{5}ms_{−1}$
C
$5.92×10_{5}ms_{−1}$
D
$599.92×10_{5}ms_{−1}$
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Solution
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Correct option is C)
$K.E.=1eV$
$=1.6×10_{−19}J$
Mass of electron,
$m=9.1×10_{−31}㎏$
$∴K.E.=21 mv_{2}$
$⇒v=m2K.E. =9.1×10_{−31}2×1.6×10_{−19} $
$=5.92×10_{5}m/s$
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