A proton and an \( \alpha \)-particle are accelerated through the s...

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A proton and an \( \alpha \)-particle are accelerated through the same potential difference. The ratio of de-Broglie wavelength \( \lambda_{p} \) to that of \( \lambda_{\alpha} \) is
(a) \( \sqrt{2}: 1 \)
(b) \( \sqrt{4}: 1 \)
(c) \( \sqrt{6}: 1 \)
(d) \( \sqrt{8}: 1 \)
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