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The wavelength of the characteristic Kal...

The wavelength of the characteristic `K_alpha` X - rays of iron and potassium are `1.931 xx 10^(-8)cm` and `3.737 xx 10^(-8)cm` respectively .What is the atomic number of an element for which the characteristic `K_alpha` wavelength is `2.289 xx 10^(-8) cm` ?

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