# "Explain" questions — IB DP Physics Higher Level (2023 syllabus)

> 110 questions · physics

## How to answer

WHAT + WHY. Every point paired with a because. Structure: X happens because Y. This causes Z because … Assessment Objective: AO2. Every "explain" answer on this spec is marked against exactly this pattern.

## Sample questions

1. [Explain why a straight conducting rod moving at constant velocity through a uniform magnetic field develops an electromo…](https://www.gradenine.co.uk/q/explain-why-a-straight-conducting-rod-01bd6be6)
2. [Explain why a proton moving in a circular path in a uniform magnetic field does not gain kinetic energy, even though a m…](https://www.gradenine.co.uk/q/explain-why-a-proton-moving-in-01dea66a)
3. [Explain, using the kinetic model of an ideal gas, why the pressure of a fixed mass of gas increases when its temperature…](https://www.gradenine.co.uk/q/explain-using-the-kinetic-model-of-053eb865)
4. [Explain how the restoring force acting on a mass–spring system gives rise to simple harmonic motion, and state the condi…](https://www.gradenine.co.uk/q/explain-how-the-restoring-force-acting-0654a7f8)
5. [Explain why a uniform solid cylinder and a uniform hollow cylinder of the same mass and outer radius, released simultane…](https://www.gradenine.co.uk/q/explain-why-a-uniform-solid-cylinder-0711d61c)
6. [Explain why electrons in an atom can only occupy discrete energy levels rather than a continuous range of energies, and …](https://www.gradenine.co.uk/q/explain-why-electrons-in-an-atom-08ecd052)
7. [Explain why evaporation from the surface of a liquid causes the temperature of the remaining liquid to decrease.](https://www.gradenine.co.uk/q/explain-why-evaporation-from-the-surface-099916e1)
8. [Explain how the Lorentz transformation for time differs from the Galilean transformation for time, and describe the phys…](https://www.gradenine.co.uk/q/explain-how-the-lorentz-transformation-for-0a0c1bd1)

## Related

- [IB DP Physics Higher Level (2023 syllabus) revision notes](https://www.gradenine.co.uk/learn/ib-dp-physics-higher-level-2023-syllabus)
- [IB DP Physics Higher Level (2023 syllabus) past papers](https://www.gradenine.co.uk/past-papers/ib-dp-physics-higher-level-2023-syllabus)
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