Object: A sheet of paper wrapped into a megaphone and a microphone

Good morning, boys and girls. How far will your voice travel? Some of you have loud voices. I can hear you a long way off. Some of you have very quiet voices. I can barely hear you when you are sitting right beside me. I understand that the average man's voice can be heard on a very still day, about 600 feet away. That is over a tenth of a mile. It might help to take a piec…