There are a number of impact rankings given to journals to attempt to measure how impactful, or great the reach of a journal is. Higher impact journals are generally able to publish the most rigorous, quality research articles, so looking at journal rankings might help you determine what journals to follow and search for sources for your research.
Journal rankings are also problematic, and several different formulas to attempt to measure impact have been developed. The different formulas each put different emphasis on different things. Three of the measures for ranking journals are:
Follow these steps to find ranked lists of physics journals:
Journal Impact Factor & Eigenfactor:
SCImago Journal & Country Reports: