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When the voltage applied to an X-raytube increased fromV_(1)15.5 KV to V_(2) = 31 KV, the wavelength interval between the K_(alpha) line and theshort wavelength cut-off of the continuous X-ray spectrum increasesby a factor of 1.3. If the atomic number of the element of the target is 13N, where N is an integer find N (Take : hc = 1240 eV and R=1xx10^(7)//m) |
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Answer» `(1)/(lambda_(K alpha))=R(Z-1)^(2)((1)/(1^(2))-(1)/(2^(2)))` `(143)/(10)(lambda_(K alpha)-lambda_(th))=(lambda_(Kalpha)-(lambda_(th))/(2))` `(3)/(10)lambda_(K alpha)=((13)/(10)-(1)/(2))lambda_(th)` `(3)/(10)((4xx10^(-7))/(3(z_(7))^(2)))=((8)/(10))(12.4xx10^(-7))/(15.5xx10^(3))RARR(5000)/(8)=(z-1)^(2)` `625=(z-1)^(2) " " rArr z = 26` |
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