Question 17N.3.SL.TZ0.3
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.3.SL.TZ0.3 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | State, Suggest | Question number | 3 | Adapted from | N/A |
A student is running an experiment to determine the acceleration of free-fall g. She drops a small metal ball from a given height and measures the time t taken for it to fall using an electronic timer. She repeats the same experiment several times.
Suggest a reason for repeating the experiment in the same conditions.
[1]
«to reduce» random errors
to reduce absolute uncertainty
to improve precision
OWTTE
Do not accept just “to find an average” or just “reduce error”
Ignore any mention to accuracy
[Max 1 Mark]
With the collected data she determines the value of g to be (10.4 ± 0.7) m s–2. Researching scientific literature about the location of her experiment she finds the value of g to be (9.807 ± 0.006) m s–2. State, with a reason, whether her experiment is accurate.
[2]
as the literature value is within the range «9.7 − 11.1»
hence it is accurate
OWTTE
MP2 must be correctly justified
