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To produce characteristic `X` - rays using a Tungsten target in an X - ray generator , the accelerating should be greater than ……. Volts and the energy of the characterization is …… eV . (The binding energy of the intermost electron in Tungsten is - 40keV). |
Answer» Correct Answer - b For minimum accelerating voltage , the electron should jump from `n = 2 to n = 1` level ` For characteristic X-rays , `(1)/(lambda) = R_(alpha) (z - 1) ^(2) [1 - (1)/(n^(2))]` `= R_(alpha) (z - 1) ^(2)` But `E = h ( c)/(lambda) implies (1)/(lambda) = (E)/(hc)` `:. (E)/(hc) = R_(alpha) (E)/(hc)` implies (E_(1))/(E_(2)) = [[1 - (1)/(2^(2))]]/[[1 - (1)/(alpha^(2))]]` ` = E_(1) = (3)/(4) E_(2) = (3)/(4) 40.000 eV = 30.000 eV` |
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