An X-ray tube with a copper target is found to emit lines other than those due to copper.The `K_(a) `line copper is known to have a wavelength 1.54505 A and other two `K _(a) `lines observed have wavelengths 0.7092 A and 1.6578 A. Identify the impurities (find the value of Z, atomic number).

Explanation

To solve the problem of identifying the impurities in the X-ray tube with a copper target, we will use Moseley's law, which relates the wavelength of emitted X-rays to the atomic number of the element.

### Step-by-Step Solution:

1. **Understand Moseley's Law**:
Moseley's law states that the wavelength of the K-alpha line is given by the formula:
\[
\frac{1}{\lambda} = R(Z - 1)^2
...