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Find the closest integer wavelength value of K α line (in picometer) in copper (Z = 29) if the wavelength of K α = line in iron (Z = 26) is known to be equal to193 picometer.

Correct answer

154

Step-by-step solution

By Mosely law 1 λ ∝ (Z –1) 2 λ 2 193 = 26 - 1 2 29 - 1 2 λ 2 = 193 × 25 2 28 2 λ 2 = 153.8 pm ≃ 154 pm

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