| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.SL.TZ1.29 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 29 | Adapted from | N/A |
Question
Greenhouse gases
A. reflect infrared radiation but absorb ultraviolet radiation.
B. reflect ultraviolet radiation but absorb infrared radiation.
C. transmit infrared radiation but absorb ultraviolet radiation.
D. transmit ultraviolet radiation but absorb infrared radiation.
Markscheme
D
Examiners report
Greenhouse gases allow ultraviolet to pass through them (i.e. they transmit ultraviolet light) but absorb infrared radiation.
Syllabus sections
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