1.

The X-ray wavelength of \[{{L}_{\alpha }}\] line of platinum (Z=78) is \[1.30{AA}.\] The X ?ray wavelength of \[{{L}_{\alpha }}\] line of Molybdenum (Z=42) is                                                [EAMCET (Eng.) 2000]

A.  5.41 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
B. 4.20 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
C. 2.70 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]                                      
D. 1.35 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
Answer» B. 4.20 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]


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