Here's question 11(d)(iii) from the June 2003 OCR Physics in Action exam. See if you can answer it out of context:
Flumoxed? Here's the answer extracted from the mark scheme:
So if you said Mary should cover her ears (or other alternative wording), pat yourself on the back — you just got a mark.
How young would you have to be not to get that?
Last year, 24.1% of A-level students (of which the AS examinations are a part) were awarded an A grade.