IB Physics SL S2.1.2 Designing Investigations

Practise designing fair investigations by defining variables, selecting suitable ranges and measurements, and justifying controls, repeats and practical improvements.

Exam points

identify the independent and dependent variables and state how each will be measured
choose a suitable data range and repeat or distribute readings to reveal variation reliably
justify a controlled variable by linking it to isolation of the independent variable's effect

[Maximum number: 1]

A student investigates whether the Stefan-Boltzmann law, $L=4 \pi \sigma R^{2} T^{4}$ , applies to stars.
L= luminosity of the star, in W
$\sigma=$ Stefan-Boltzmann constant
R= radius of the star, in m
T= surface temperature of the star, in K
To verify the law, they obtain values from databases and manipulate the data as shown.

Table for Question S2.1.2—Designing investigations question 1 — IB Physics SL

Suggest a possible improvement of the investigation, related to the range of the surface temperatures of the stars selected.

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S2.1.2—Designing investigations question 1