DP Physics (last assessment 2024)
Question 19M.2.HL.TZ2.7cii
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.HL.TZ2.7cii |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Suggest | Question number | cii | Adapted from | N/A |
cii.
[Maximum mark: 1]
19M.2.HL.TZ2.7cii
The average temperature of ocean surface water is 289 K. Oceans behave as black bodies.
The intensity in (b) returned to the oceans is 330 W m-2. The intensity of the solar radiation incident on the oceans is 170 W m-2.
(cii)
Suggest a mechanism by which the additional intensity can be lost.
[1]
Markscheme
conduction to the air above
OR
«mainly» evaporation
OR
melting ice at the poles
OR
reflection of sunlight off the surface of the ocean ✔
Do not accept convection or radiation.
Examiners report
Many candidates didn’t understand this question and thought that the answer needed to be some form of human activity that would reduce global temperature rise.
