I wonder if anyone can help? I'm a primary teacher working in Y6 and for an observed lesson in a couple of weeks time I'd like the children to investigate which travels faster, sound or light. This will be at a very basic level. I've found an activity where you divide the class as far apart as you can - across the school field or playground. One team then shine a torch and blow a whistle at the same time. The idea is that the other team should see the light fractionally before they hear the whistle. I know that this isn't the most scientific of investigations, but as a quick, practical way of showing that light travels faster than sound, would it work? Usually I'd test science investigations out for myself before doing them in class, but I live by myself so this one's a bit tricky! Thanks for any help or ideas.