DP Physics (first assessment 2025)
Question 19M.1B.SL.TZ1.1a.ii
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.1B.SL.TZ1.1a.ii |
| Level | SL | Paper | 1B | Time zone | TZ1 |
| Command term | Deduce | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 2]
19M.1B.SL.TZ1.1a.ii
(a.ii)
Deduce the value of g and its absolute uncertainty for this experiment.
[2]
Markscheme
g = 9.996 «m s−2» OR Δg = 4.20 «m s−2» ✔
g = (10 ± 4) «m s−2»
OR
g = (10.0 ± 4.2) «m s−2» ✔
Award [1] max for not proper significant digits or decimals use, such as: 9.996±4.178 or 10±4.2 or 10.0±4 or 10.0±4.18« m s−2 » .
Examiners report
Many average candidates did not use the correct number of significant figures and wrote the answers inappropriately. Only the best candidates rounded out and wrote the proper answer of 10±4 ms−2. Some candidates did not propagate uncertainties and only compared the average calculated value with the known value 9.81 ms−2.
