A) \[1.52\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[0.71\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[0.36\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[2.5\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
[a] : From Moseley?s law, as \[\lambda \propto \frac{1}{{{(Z-1)}^{2}}}\] \[\frac{{{\lambda }_{Mo}}}{{{\lambda }_{MCu}}}=\frac{({{Z}_{cu}}-{{1}^{2}})}{{{({{Z}_{Mo}}-1)}^{2}}}=\frac{{{(29-1)}^{2}}}{{{(42-1)}^{2}}}=0.4663\] or \[{{\lambda }_{Cu}}=\frac{{{\lambda }_{Mo}}}{0.4663}=\frac{0.71\overset{\text{o}}{\mathop{\text{A}}}\,}{0.4663}=1.52\overset{\text{o}}{\mathop{\text{A}}}\,\]
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