A proton and an \( \alpha \)-particle are accelerated through the same potential difference. The....

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A proton and an \( \alpha \)-particle are accelerated through
\( \mathrm{P} \)
the same potential difference. The ratio of their deBroglie wavelength is
(A) \( \sqrt{2} \)
(B) \( 1: \sqrt{2} \)
(C) \( 2 \sqrt{2}: 1 \)
(D) 2


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