1.

In the X-rays produced by a Coolidge tube let λc be the cut-off wavelength, λα be the wavelength of the Kα line and λβ be the wavelength of the Kβ line.(a) λβ > λα > λc(b) λα > λβ  >  λc(c) λα > λc > λβ(d) λβ > λc > λα

Answer»

Correct Answer is: (b) λα > λβ  >  λc

The cut-off wavelength appears when the entire energy of the incident electron gets converted to a photon. Hence, λc is the shortest possible wavelength. The Kβ transition, from M shell to K shell, involves more energy than the Kα transition, from L shell to K shell. Hence, λβ < λα.



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