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IB Physics HL B 2 3 Albedo Questions

Practise IB Physics HL B.2.3 by analysing albedo, atmospheric scattering and snow–ice feedback in planetary climate models.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Calculate albedo as reflected power divided by incident power, then use surface-reflectivity differences to predict how ice loss changes absorbed solar energy.
  • Apply albedo to planetary radiation diagrams to calculate reflected, absorbed or radiated intensity, including cloud and snow reflections.
  • Calculate absorbed solar energy for melting ice from the non-reflected fraction and estimate melt time under stated heat-loss assumptions.

IB Physics HL B 2 3 Albedo Questions question 1

[Maximum number: 1]

A planet has an albedo of 0.30 . A simplified energy balance for the planet is shown.

Figure for Question IB Physics HL B 2 3 Albedo Questions question 1 — IB Physics HL

What is the intensity radiated by the surface of the planet?

A

70Wm−270 \mathrm{Wm}^{-2}

B

90Wm−290 \mathrm{Wm}^{-2}

C

100Wm−2100 \mathrm{Wm}^{-2}

D

130Wm−2130 \mathrm{Wm}^{-2}

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