JEE Advanced 2008 Physics question

Which one of the 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 targetCorrect
(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

Answer: (B)

Solution

The cut-off wavelength depends only on accelerating voltage, not on target atomic number, so statement (B) is wrong.

Question ID VK-000787