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IB Physics SL B.2.1 Conservation of energy Question Bank

Practise IB Physics SL B.2.1 by balancing incoming, reflected, absorbed and emitted radiation in planetary climate models.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • Use incoming and outgoing power to calculate temperature-change time or radiated intensity in climate models.
  • Apply energy-balance diagrams to determine reflected, absorbed and emitted radiation from a planet's surface.

B.2.1—Conservation of energy question 1

[Maximum number: 1]

In an energy-balance climate model, the power of the incoming radiation over an area A is PiP_{\mathrm{i}} and the power of the outgoing radiation over the same area is PoP_{\mathrm{o}}. The surface heat capacity is CsC_{\mathrm{s}}. What is the time taken to increase the temperature of the area by θ\theta ?

A

(Pi−Po)Csθ\frac{\left(P_{\mathrm{i}}-P_{\mathrm{o}}\right)}{C_{\mathrm{s}} \theta}

B

Csθ(Pi−Po)\frac{C_{\mathrm{s}} \theta}{\left(P_{\mathrm{i}}-P_{\mathrm{o}}\right)}

C

ACsθ(Pi−Po)\frac{A C_{\mathrm{s}} \theta}{\left(P_{\mathrm{i}}-P_{\mathrm{o}}\right)}

D

A(Pi−Po)Csθ\frac{A\left(P_{\mathrm{i}}-P_{\mathrm{o}}\right)}{C_{\mathrm{s}} \theta}

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