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. remain constant
B. increases
C. becomes half
D. decreases

Answer

B

Explanation

`Delta lambda = lambda_(Ka) - lambda_("min")`
When V is halved `Delta_("min")` becomes two times but `lambda_(K alpha)` remains the same.
`Deltalambda' = lambda_(K alpha) - 2lambda_("min") = 2(Delta lambda) - lambda_(K alpha) Delta lambda' lt 2 (Delta lambda)`