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Q.

The wavelength of Kα line from an element of atomic number 51 is λ. From another element the wavelength of Kα line is 4λ. What is the atomic number of the second element?

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answer is 26.

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Detailed Solution

We use λ1λ2=Z2−1Z1−12⇒ Z2=Z1−1λ1λ2+1=50×λ4λ+1=26

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