Rods that all have the same shape and size are pushed through corks into an empty tank. Every rod is coated with a layer of solid wax with a low melting point. Hot water is then poured into the tank, as shown. After some time, part of the wax melts. On which rod will the wax melt first?
- Aall at the same time
- Bgood thermal conductor
- Cbad thermal conductor
- Dmoderate thermal conductor