Two large parallel plates are connected with the terminal of \( 100 \mathrm{~V} \) power supply....

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Two large parallel plates are connected with the terminal of \( 100 \mathrm{~V} \) power supply. These plates have a fine hole at the centre. An electron having energy \( 200 \mathrm{~V} \) is so directed that it passes through the holes. When it comes out its deBroglie wavelength is
(A) \( 1.22 \AA \)
(B) \( 1.75 \AA \)
(C) \( 2 \AA \)
(D) None of these
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