In X-ray tube when the accelerating voltage V is halved.the difference between the wavelength of `K_(alpha)` line and minimum wavelength of continuous X-ray spectrum

Options

A. Remains constant
B. Becomes more than two times
C. Becomes half
D. Becomes less than two times

Answer

D

Explanation

Change in wavelength
`Deltalamda=lamda_(kalpha)-lamda_("min")`
Now , `Deltalamda.=lamda_(kalpha)-2lamda_("min")" " ("as " V.=1/2V)`
or `Deltalamda.=2lamda_(kalpha)-2lamda_(min)-2lamda_(k_alpha)+lamda_(k_alpha)=2(Deltalamda)-lamda_(k_alpha)`
`Delta lamda. gt 2 Deltalamda`