Which one of the following statements is wrong in the context of X-rays generated from an 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