Thermal energy is delivered at an equal rate to four bars made from different materials. After a few minutes, a temperature difference exists between X and Y for each bar. Which statement identifies the bar with the largest temperature difference between points X and Y, and states the correct reason?
- Acopper because it is a good conductor of thermal energy
- Blead because it is the densest metal
- Cplastic because it is a poor conductor of thermal energy
- Dwood because it is a good conductor of thermal energy