In an Xray tube containing tungsten target , 50kV voltage is applied. Calculate the minimum wavelength of xray emitted. If the target is replaced by molybdenum will the min. wavelength change. Justify your answer? I used λ min= hc/eV= 2.481×10^ (-11) m for the 1st part. For the 2nd part I am clueless. I infer from observing graphs given in text books that molybdenum should have higher λmin than tungsten. Z=74 for tungsten and Z=42 for molybdenum. But cant come up with a rigid justification. Should i use (λΤ/λ Μο)=( ΖΜο-1/ΖΤ-1)^2??