In an X-ray tube, the voltage applied is `20 kV`. The energy required to remove an electron from`L shell is 19.9 ke V` In the X-rays emitted by the tube.

Options

A. minimum wavelength will be `62.1 nm`.
B. energy of the characteristic x-rays will be equal to oe less than `19.9 ke V`.
C. `L_(alpha)` X-ray may be emitted.
D. `L_(alpha)` X-ray will have energy `19.9 ke V`.

Answer

A, B, C

Explanation

`lambda_(min) = lambda_(min) = (12400)/(v_(0)) Å = (12400)/(20.000) = 62 Å`