Question

Which of the following statements are correct :

• A. Cut-off wavelength depends on atomic number of the anode atom
• B. Cut-off wavelength only depends upon the accelerating potential of the Coolidge tube setup
• C. Wavelength of K-alpha characteristic X-Ray depends upon the atomic number of the anode atom according to Moseley’s law
• D. Wavelength of K-alpha X-ray does not depend upon the accelerating potential of the Coolidge tube setup

Answer 1

Answer: (A), (C)

The correct options are
A

Cut-off wavelength depends on atomic number of the anode atom

C

Wavelength of K-alpha characteristic X-Ray depends upon the atomic number of the anode atom according to Moseley’s law

Cut-off wavelength depends on the maximum energy of the striking electron which has nothing to do with the anode atom. It's a function of accelerating potential. At the same time, Moseley figured out that the wavelength of K characteristic x-ray depends on the atomic number of the anode atom.