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The questions states:

**Calculate the wavelength of L(alpha) and L(beta) x-ray photons produced from a copper target (Z=29)**

I have tried finding the wavelength using E=hc/lambda and re-arranged for lambda (lambda=hc/E)

Is this the correct approach to solving the problem? Alpha and beta rays travel at the same speed ~ 3*10^8m/s, seems like I'm missing something.

I don't want answers as this doesn't help me in any way but just need some guidance as to how it can be worked out.

Your help is much appreciated..