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If the frequencies of \( \mathrm{K}_{\alpha}, \mathrm{K}_{\beta} \) and \( \mathrm{L}_{\alpha} \) X-rays for a material \( v_{\mathrm{K}_{\alpha}}, v_{\mathrm{K}_{\beta}}, v_{\mathrm{L}_{\alpha}} \) respectively, then
(A) \( v_{\mathrm{K}_{\alpha}}=v_{\mathrm{K}_{\beta}}+v_{\mathrm{L}_{\alpha}} \)
(B) \( v_{L_{\alpha}}=v_{K_{\alpha}}+v_{K_{\beta}} \)
(C) \( v_{\mathrm{K}_{\beta}}=\mathrm{v}_{\mathrm{K}_{\alpha}}+\mathrm{v}_{\mathrm{L}_{\alpha}} \)
(D) none of these
\( P \)
W.
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