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Question

The de-Broglie wavelength of an electron (mass 1×1030kg, charge=1.6×1019 C) with kinetic energy of 200eV is: (Planck's constant 6.6×1034J):

A
9.60×1011m
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B
8.25×1011m
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C
6.25×1011m
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D
5.00×1011m
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