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Question

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

A
102 ms1
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B
103 ms1
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C
10 ms1
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Solution

The correct option is B 103 ms1
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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