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WBJEE 2017 Physics Solved Paper

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Question : 22 of 40

Marks: +1, -0

The de Broglie wavelength of an electron is 0.4×10–10 m when its kinetic energy is 1.0 keV. Its wavelength will be 1.0×10–10 m, when its kinetic energy is

0.2 keV
0.8 keV
0.63 keV
0.16 keV

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