10 (ii)
Here are two diagrams showing how a smoke detector works. americium
alarm
air inside smoke detector alpha radiation
alpha detector
smoke
Use the diagrams to describe how a smoke detector works. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2]
5
Patrick walks on a nylon carpet.
carpet
He becomes negatively charged. (a) Describe how Patrick has become negatively charged. ................................................................................................................................................... ............................................................................................................................................. [2]
Š OCR 2015