Which of the following is Mosely’s equation if ‘C’ is the speed of light, ‘a’ is proportionality constant, ‘σ’ is a constant which depends on electronic transition series, ‘Z’ is the atomic number and ‘λ’ is the wavelength?

• A. Cλ= a(Z-σ)2
• B. C/λ= a(Z-σ)2
• C. C(Z-σ)2= aλ
• D. C(Z-σ)2= a/λ