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A proton, a neutron, an electron and an \( \alpha \)-particle have same energy. Then their de Broglie wavelengths compare as
\( \mathrm{P} \)
(a) \( \lambda_{\mathrm{p}}=\lambda_{\mathrm{n}}\lambda_{\mathrm{e}}\lambda_{\alpha} \)
W
(b) \( \lambda_{\alpha}\lambda_{\mathrm{p}}=\lambda_{\mathrm{n}}\lambda_{\mathrm{e}} \)
(c) \( \lambda_{\mathrm{e}}\lambda_{\mathrm{p}}=\lambda_{\mathrm{n}}\lambda_{\alpha} \)
(d) \( \lambda_{\mathrm{e}}=\lambda_{\mathrm{p}}=\lambda_{\mathrm{n}}=\lambda_{\alpha} \)
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