The wavelength of the K_alpha line for an element of atomic number 57 is λ. What is the wavelength of K_alpha line for the element of atomic number 29?

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Question

Prashant Kotian · Accepted Answer

Correct answer: C. Moseley's law: lambda_2/lambda_1 = [(Z_1-1)/(Z_2-1)]^2. lambda_29 = λ * [(57-1)/(29-1)]^2 = λ * (2)^2 = 4*λ.

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