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The wavelength of Kα X-rays produced by an X-ray tube is 0.76 Ao. The atomic number of the anode material of the tube is

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a
20
b
60
c
40
d
80

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detailed solution

Correct option is C

The wavelength of X-ray lines is given by Rydberg Formula 1λ=RZ21n12−1n22For  Kα  line,  n1=1  and  n2=2∴431.097×107m−10.76×10−10m1/2=39.99≈40


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