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IB Physics SL B 2 5 Solar Constant S Questions

Practise IB Physics SL B.2.5 by defining the solar constant and explaining why its measured value is an approximation.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • Identify normal reaction, friction, tension, elastic restoring force, viscous drag and buoyancy as contact forces between bodies.
  • Select and represent the appropriate contact force, direction and model for a stated physical situation using complete mark-scheme evidence.

IB Physics SL B 2 5 Solar Constant S Questions question 1

[Maximum number: 1]

The diagram shows a simplified energy-balance model for the Earth surface–atmosphere system.

Figure for Question IB Physics SL B 2 5 Solar Constant S Questions question 1 — IB Physics SL

The following data are given:

 Average albedo of Earth =0.30 Average global temperature of the surface =288 K Average Earth-Sun distance =1.5×1011 m\begin{aligned} \text { Average albedo of Earth } & =0.30 \\ \text { Average global temperature of the surface } & =288 \mathrm{~K} \\ \text { Average Earth-Sun distance } & =1.5 \times 10^{11} \mathrm{~m} \end{aligned}

State what is meant by the solar constant.

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