1.

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/λI 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»

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.



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