A) \[0.31\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[3.1\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[31\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[311\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
For continuous X-rays, minimum wavelength produced, \[{{\lambda }_{\min }}=\frac{hc}{eV}\] \[=\frac{12375}{(energy\,in\,eV)}\overset{{}^\circ }{\mathop{\text{A}}}\,\] \[=\frac{12375}{40\times {{10}^{3}}}\overset{{}^\circ }{\mathop{\text{A}}}\,=0.31\overset{{}^\circ }{\mathop{\text{A}}}\,\]
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