No, redshift itself does not cause repeating absorption lines for the same element. Redshift refers to the phenomenon where light or electromagnetic radiation from an object is shifted towards longer wavelengths (lower frequencies) due to the motion of the source away from the observer.
Repeating absorption lines for the same element in a spectrum are typically caused by the presence of multiple energy levels within that element's atomic structure. When light passes through a medium, such as a cloud of gas, the atoms or molecules in the medium can absorb specific wavelengths of light, resulting in dark absorption lines in the spectrum.
These absorption lines correspond to transitions between different energy levels within the atoms or molecules. Each element has its own unique set of energy levels, and thus its own characteristic set of absorption lines.
Redshift can affect the observed wavelengths of these absorption lines, shifting them to longer wavelengths. However, the redshift itself does not create additional absorption lines or repeat them. The number and positions of the absorption lines depend on the specific energy levels of the element and the conditions of the absorbing medium.
So, while redshift can affect the overall appearance of the absorption lines in a spectrum, the repeating absorption lines for the same element are determined by the element's atomic structure and the properties of the absorbing medium, rather than the redshift itself.