Q5 of 59 Page 393

If the current in the circuit for heating the filament is increased, the cutoff wavelength

The cut-off wavelength does not depend on the current and only depends on the potential. So, it will remain unchanged. Increasing the current will increase the number of photons per unit time which is the intensity of x-rays.

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3

The energy of a photon of characteristic X-ray from a Coolidge tube comes from

 4

If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength

 6

Moseley’s law for characteristic X-rays is √v = a (Z – b). In this,

 7

Frequencies of Kα X-rays of different materials are measured. Which one of the graphs in figure may represent the relation between the frequency v and the atomic number Z.

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