E6F09:What is the efficiency of a photovoltaic cell?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E6F09 is The relative fraction of light that is converted to current.

The key fact is The relative fraction of light that is converted to current. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.