The operating potential in an x-ray tube is increased by 2%. The percentage change in the cut off wavelength is

Options

A. 1% increase
B. 2% increase
C. 2% decrease
D. 1% decrease

Answer

C

Explanation

`lambda_(min) prop (1)/(V) prop V^(-1)`
% change in `lambda_(min) = (-1)`(% change in V) for
small % changes