JEE Advanced 2024 Physics question
A metal target with atomic number is bombarded with a high energy electron beam. The emission of X-rays from the target is analyzed. The ratio of the wavelengths of the -line and the cut-off is found to be . If the same electron beam bombards another metal target with , the value of will be
Answer: (A)
Solution
The cut-off wavelength depends only on the accelerating voltage, which is the same for both targets. By Moseley's law the wavelength satisfies . Hence $r =
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