(adsbygoogle = window.adsbygoogle || []).push({}); 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.

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# Homework Help: X-ray Wavelengths

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