Which sequence correctly lists common materials in order of descending conductivity?

The correct sequence that lists common materials in order of descending conductivity is silver, copper, aluminum, iron, lead. This arrangement is based on the well-established electrical conductivity hierarchy of these metals.

Silver is the most conductive metal, making it the top choice. It has the highest electron mobility, allowing electric current to flow through it more easily than through any other material. Following silver is copper, which also has excellent conductivity and is widely used in electrical wiring and components.

Next in the sequence is aluminum. While not as conductive as copper, aluminum remains a very good conductor, and its lighter weight and corrosion resistance make it a popular choice in various applications, including power lines.

Iron comes next; it is less conductive than aluminum and copper but still conducts electricity better than many other materials. Finally, lead, while it does conduct electricity, is much less efficient compared to the other metals listed and is therefore positioned at the end of this sequence.

This understanding of electrical conductivity is essential for applications in electrical engineering and communications, where material choice impacts performance and efficiency.