A student tests four wall panels. Each panel has the same area and the same temperature difference across it.
The table describes the panels.
| Panel | Thickness | Thermal conductivity |
|---|---|---|
| P | thin | high |
| Q | thick | high |
| R | thin | low |
| S | thick | low |
Which pair gives the panel with the greatest rate of energy transfer and the panel with the smallest rate?
greatest Q; smallest R
greatest R; smallest Q
greatest P; smallest S
greatest S; smallest P