Question 19M.2.SL.TZ1.a.ii
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.SL.TZ1.a.ii |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | a.ii | Adapted from | N/A |
The Moon has no atmosphere and orbits the Earth. The diagram shows the Moon with rays of light from the Sun that are incident at 90° to the axis of rotation of the Moon.
Another black body is on the Moon’s surface at point B.
Outline, without calculation, why the aximum temperature of the black body at point B is less than at point A.
[2]
energy/Power/Intensity lower at B ✔
connection made between energy/power/intensity and temperature of blackbody ✔
This is question is another example of candidates not thinking beyond the obvious in the question. Many simply said that point B is farther away, or that it is at an angle. Some used vague terms like “the sunlight is more spread out” rather than using proper physics terms. Few candidates connected the lower intensity at B with the lower temperature of the blackbody.
