1. The problem statement, all variables and given/known data The tube in a medical research X-ray unit uses lead (Z=82) as it's target. Assume the electrons are accelerated through the voltage calculated in part (b). What is the wavelength of the Kα line? 2. Relevant equations KE=-13.6 ev ((Z-1)squared) / (1squared) KE=PE=VQ E=QV λ=hc/E 3. The attempt at a solution KE=-13.6 ev ((Z-1)squared) / (1squared) KE =-13.6 ev ((82-1)squared)/ 1 squared) KE=89229.6 ev KE=PE=QV 89229.6=(1.602E-19 J/ev)V V=89229.6 V E=QV E=(1.602E-19 C)(89229.6V) E=1.429E-14 J λ=hc/E λ=((6.63E-34 J*s)(3E8 m/s))/(1.429E-14 J) λ=1.3856E-11 m = 0.013856 nm I'm not sure what's wrong... I correctly solved for KE and V, but I can't seem to solve for λ.