| Date | May 2012 | Marks available | 1 | Reference code | 12M.3.hl.TZ1.D1 |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Identify | Question number | D1 | Adapted from | N/A |
Question
Alcohol abuse is a major problem in many countries, especially when associated with driving. Many police forces now use instruments that detect the presence of ethanol on a person’s breath by its absorption of electromagnetic radiation.
Identify the region of the electromagnetic spectrum used to detect the presence of ethanol.
Markscheme
infrared/IR;
Examiners report
This was well answered. Most students knew that the IR absorption is used for ethanol detection.
