- #1
conniechiwa
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Homework Statement
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?
Homework Equations
KE=-13.6 ev ((Z-1)squared) / (1squared)
KE=PE=VQ
E=QV
λ=hc/E
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.