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The characteristics X-rays wavelength is...

The characteristics X-rays wavelength is related to atomic number by the relation `sqrt(nu)=a(Z-b)`
When Z is the atomic number, a and b are Mosley's constants. If `lambda_(1)=2.886Å` and `lambda_(2)=2.365Å` corresponding to `Z_(1)=55 and Z_(2)=60` respectively, the value of Z corresponding to `lambda=2.660Å` is

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