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A metal target with atomic number Z = 46 is bombarded with a high energy electron beam. The emission of X-rays from the target is analyzed. The ratio r of the wavelengths of the K -line and the cut- off is found to be r = 2. If the same electron beam bombards another metal target with Z = 41, the value of r will be
- 2.53
- 1.27
- 2.24
- 1.58
Correct answer: 2.53
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