2. Make a walkie – talkie with two empty soup cans and some string. Hammer a hole
into the closed ends of the cans. Pull a string or wire through the opening and tie
washers to the ends so they cannot come out through the holes. Place a tape along the
edges of the open end of the can for safety. Talk into one can while your friend listens
in the other. Pull the string or wire taut. Why can he or she hear you? Place one can
undet water and listen to the other while your friend splashes. Do you hear anything?
Image taken from Conceptual Science and Beyond 4
salamat po lodi sa point