IB Physics HL S2.3.1 Concluding Questions

Draw HL evidence-based conclusions, comparing measured values with accepted results and using peer review and reproducibility to build scientific agreement.

Exam points

Justify conclusions by linking them to processed data, uncertainty and the stated investigation objective.
Discuss scientific context, limitations and how uncertainty affects the strength of conclusions using complete evidence.

[Maximum number: 1]

A group of students is trying to determine the density and the viscosity of a liquid.

To determine the density, they use a balance to read the mass m of a sphere in air and immersed in the liquid.

They use a sphere of volume $V=1.827 \times 10^{-7} \mathrm{~m}^{3}$ .
The readings are $m_{\text {air }}=1.427 \mathrm{~g}$ in air and $m_{\text {immersed }}=1.208 \mathrm{~g}$ in the liquid.
The readings are different due to buoyancy. The buoyancy force $F_{\mathrm{b}}$ is given by

F_{\mathrm{b}}=\rho V g

where V is the volume of the sphere and $\rho$ is the density of the liquid.

The students search literature values and find the viscosity of this liquid to be 0.24 , when expressed in SI base units.

Suggest a conclusion reached by the students.

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IB Physics HL S2.3.1 Concluding Questions question 1