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Question

The kinetic energy of an electron is 4.55×1025 J. The mass ofelectron is 9.1×1031kg. Calculate velocity of the electron.


A

10 ms-1

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B

102 ms-1

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C

103 ms-1

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D

104 ms-1

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Solution

The correct option is C

103 ms-1


Calculation of the velocity of energy:
Kinetic energy =12mv2=4.55×1025 J

=4.55×1025k gm2s2

Or v2=2×KEm=2×(4.55×1025kg m2S2)(9.1×1031kg)

=106m2s2

Or velocity (v)=(106m2s2)12=103ms1


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