X-Rays - 6

1. Which one of following statements is Wrong in the context of X-rays generated from a X- ray tube ?

(A) Wavelength of characteristic X-rays decreases when the atomic number of the target increases

(B) Cut-off wavelength of the continuous X-rays depends on the atomic number of the target

(C) Intensity of the characteristic X-rays depends on the electrical power given to the X-ray tube

(D) Cut-off wavelength of the continuous X-rays depends on the energy of the electrons in the X-ray tube

(JEE 2008)

Answer (B)

Reason:m (λc) cuttoff wavelength is given as
λc = hc/K.E. = hc/eV

Hence λc does not depend on atomic number of target but depends on potential difference between cathode and anode (target)