Question

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

I have been asked this question in unit test.

My doubt stems from X-Ray Fluorescence Spectrometry topic in section X-Ray Spectrometers of Analytical Instrumentation

Answer 1

The correct option is (b) C/λ= a(Z-σ)^2

For explanation I would say: The Mosely’s equation is, C/λ= a(Z-σ)^2.

It gives the relationship between the speed of light, reciprocal of wavelength and atomic number.