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 the same potential difference. The ratio of their de Broglie wavelength is:
(A) \( \sqrt{2} \)
(B) \( \frac{1}{\sqrt{2}} \)
(C) \( 2 \sqrt{2} \)
(D) 2
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