Two identical solid copper blocks, Block A and Block B, are placed at equal distances from a high-intensity infrared radiant heater inside a vacuum chamber. Block A has a matte black surface coating, while Block B has a highly polished, reflective silver surface coating. Both blocks start at an ambient temperature of 20∘C20^\circ\text{C}20∘C.
The heater is switched on, and the temperatures of the blocks are monitored over a period of 15 minutes. The results are plotted in the graph below.
| Time (minutes) | Temperature of Block P (∘C^\circ\text{C}∘C) | Temperature of Block Q (∘C^\circ\text{C}∘C) |
|---|---|---|
| 0 | 20 | 20 |
| 3 | 42 | 26 |
| 6 | 58 | 31 |
| 9 | 67 | 34 |
| 12 | 71 | 36 |
| 15 | 74 | 38 |
Explain, using evidence from the data, which curve represents Block A (matte black) and which represents Block B (polished silver).