A) \[0.25\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[0.5\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[0.52\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
Minimum wavelength of X-rays \[{{\lambda }_{\min }}\frac{12375}{V}\] \[=\frac{12375}{40000}=0.32\overset{\text{ }\!\!{}^\circ\!\!\text{ }}{\mathop{\text{A}}}\,\] Therefore, the wavelength \[0.25\,\overset{\text{o}}{\mathop{\text{A}}}\,\] is not possible because it is less than \[0.32\,\overset{\text{o}}{\mathop{\text{A}}}\,\]:
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