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An X-ray tube with a copper target is fo...

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.

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