Use Moseley's law with b = 1 to find the...

Use Moseley's law with b = 1 to find the frequency of the `K_alpha` X-ray of `La(Z = 57)` if the frequency of the `K_alpha` X-ray of `Cu(Z = 29)` is known to be `1*88 xx 10^(18)` Hz.

`V_(K_beta)=V_(K_alpha)+V_(L_alpha)`

`V_(K_beta)=V_(K_alpha)-V_(L_alpha)`

`V_(K_beta)=V_(K_alpha)//V_(L_alpha)`

`V^2_(K_beta)=V_(K_alpha).V_(L_alpha)`

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