IB Physics HL B.2.8 Infrared absorption Question Bank
Practise IB Physics HL B.2.8 by analysing wavelength-selective infrared absorption, molecular energy levels and greenhouse re-emission.
- Syllabus
- First assessment 2025
- Course
- Physics HL
- Level
- HL
Exam points
- Use molecular energy levels and resonance to explain wavelength-selective absorption of Earth’s infrared radiation.
- Compare atmospheric pressure, greenhouse-gas concentration and re-emission to explain surface-temperature differences.
B.2.8—Infrared absorption question 1
[Maximum number: 3]
There is a proposal to place a satellite in orbit around planet Mars.
The ratio distance of Earth from the Sun distance of Mars from the Sun =1.5.
The atmosphere of Mars is composed mainly of carbon dioxide and has a pressure less than 1 % of that on Earth. Outline why the mean temperature of Earth is strongly affected by gases in its atmosphere but that of Mars is not.
reference to greenhouse gas/effect
recognize the link between molecular density/concentration and pressure
low pressure means too few molecules (to produce a significant heating effect)
OR
low pressure means too little radiation re-radiated back to Mars
The greenhouse effect can be described, it doesn't have to be named
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