Question

Assertion (A): When accelerating voltage is increased the cutoff wavelength of the continuous x- rays is decreased but the characteristic lines remain unaffected.

Reason (R): Continuous X-ray spectrum is a nuclear phenomenon while characteristic x-rays are an atomic phenomenon.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is B Both A and R are true but R is not the correct explanation of A

For continuous X-Rays, :-
$\lambda cutoff=\frac{hc}{ev}$
& For characteristic X-rays
$\lambda =\frac{hc}{\Delta E}$