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Q.

The Kα wavelength of an element with atomic number Z = 17 is given by λ. What is the atomic number of an element with a Kα wavelength of 4λ?

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a

4

b

5

c

7

d

9

answer is D.

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Detailed Solution

1λKα=R(Z−1)2112−122        ....(i) 1λKa′=RZ′−12112−122       ....(ii)Solving (i) and (ii) Z' = 9
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