Question 19M.3.SL.TZ2.2
| Date | May 2019 | Marks available | [Maximum mark: 5] | Reference code | 19M.3.SL.TZ2.2 |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Describe, Determine, Draw, Write down | Question number | 2 | Adapted from | N/A |
An experiment is conducted to determine how the fundamental frequency f of a vibrating wire varies with the tension T in the wire.
The data are shown in the graph, the uncertainty in the tension is not shown.
Draw the line of best fit for the data.
[1]
Any curve that passes through ALL the error bars ✔
Most candidates correctly drew curves which passed through all the error bars, some tried to draw straight lines. Quite a few did not draw any line, leaving the question unanswered. Candidates need to make sure to check that they read the question paper carefully.
It is proposed that the frequency of oscillation is given by f2 = kT where k is a constant.
Determine the fundamental SI unit for k.
[1]
kg–1 m–1 ✔
Determining the fundamental units of K (kg-1 m-1 ) was difficult for most candidates.
Write down a pair of quantities that, when plotted, enable the relationship f2 = kT to be verified.
[1]
f2 AND T
OR
f AND
OR
log f AND log T
OR
ln f AND ln T ✔
These questions were not well understood, but a few candidates were able to state that a plot of f2 versus T would give a straight line through the origin.
Describe the key features of the graph in (b)(ii) if it is to support this relationship.
[2]
graph would be a straight line/constant gradient/linear ✔
passing through the origin ✔
These questions were not well understood, but a few candidates were able to state that a plot of f2 versus T would give a straight line through the origin.
