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B.2.9—Greenhouse models Topic Practice

B.2.9—Greenhouse models Topic Practice
IB Physics syllabusPhysics SL/HLFirst assessment 2025

Practise greenhouse-model questions by matching molecular vibration frequencies to terrestrial infrared and judging which radiation is absorbed.

How this is tested

  • use f = 1/T for a molecular vibration period, then compare that frequency with solar and terrestrial infrared
  • state the model assumption that greenhouse gases absorb outgoing terrestrial infrared at resonant frequencies
  • choose the correct diagram by checking that the radiation absorbed is Earth's outgoing infrared, not sunlight
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