An X-ray tube with a copper target is found to be emiting lines other than those due to copper. The `K_(alpha)` line of coper is known to have a wavelength `1.5405 Å` and the other two `K_(alpha)` lines observed have wavelengths `0.7090 Å and 1.6578 Å` Identify the impurities.

Explanation

To identify the impurities in the X-ray tube emitting K-alpha lines other than those due to copper, we will follow these steps:

### Step 1: Understand the K-alpha line formula
The K-alpha line wavelength is related to the atomic number (Z) of the element. The formula for the K-alpha line is given by:

\[ \frac{1}{\lambda} = R \cdot (Z - 1)^2 \left( \frac{1}{1^2} - \frac{1}{2^2} \right) \]
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