A metal target with atomic number \( Z = 46 \) is bombarded with a high energy electron beam. The emission of X-rays from the target is analyzed. The ratio \( r \) of the wavelengths of the \( K_{\alpha} \)-line and the cut-off is found to be \( r = 2 \). If the same electron beam bombards another metal target with \( Z = 41 \), the value of \( r \) will be
