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The de-Broglie wavelength of an electron...

The de-Broglie wavelength of an electron is `0.4 xx 10^(-10)` m when its kinetic energy is 1.0 keV. Its wavelength will be `1.0 xx 10^(-10)`m, When its kinetic energy is

A

0.2 keV

B

0.8 keV

C

0.63 keV

D

0.16 keV

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The correct Answer is:
D
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