JEE Advanced 2007 Physics question

STATEMENT-1 : If the accelerating potential in an X-ray tube is increased, the wavelengths of the characteristic X-rays do not change. because STATEMENT-2 : When an electron beam strikes the target in an X-ray tube, part of the kinetic energy is converted into X-ray energy.

(A)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
(B)Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1Correct
(C)Statement-1 is True, Statement-2 is False
(D)Statement-1 is False, Statement-2 is True

Answer: (B)

Solution

Statement-1: characteristic X-ray wavelengths are fixed by the energy differences between the inner atomic levels of the target element, so they do not depend on the accelerating potential (only the continuous spectrum's cut-off wavelength changes):

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Question ID VK-037416