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

Explanation

To solve the problem, we will use Moseley's Law, which states that the wavelength of characteristic X-rays is inversely proportional to the square of the atomic number of the element. The relationship can be expressed as:

\[ \lambda \propto \frac{1}{Z^2} \]

Where:
- \(\lambda\) is the wavelength of the X-rays,
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