DP Physics (first assessment 2025)
Question 23M.2.SL.TZ2.d
| Date | May 2023 | Marks available | [Maximum mark: 3] | Reference code | 23M.2.SL.TZ2.d |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Explain | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 3]
23M.2.SL.TZ2.d
The design of the pad encloses the resistor in a material that traps air. The design also places the resistor close to the top surface of the pad.
Explain, with reference to thermal energy transfer, why the pad is designed in this way.
[3]
Markscheme
Air is a poor «thermal» conductor ✓
Lack of convection due to air not being able to move in material ✓
Appropriate statement about energy transfer between the pet, the resistor and surroundings ✓
The rate of thermal energy transfer to the top surface is greater than the bottom «due to thinner material» ✓
Accept air is a good insulator
