Space your students along the railing- the longer the rail, the better. Have someone at the front of the line tap a tuning fork and hold it in the air. Now have the children place an ear on the railing. The students should raise their hands when they can hear the sound. Resonance Remind the children that the vibrations need to travel to carry the sound to our ears.
Some shapes actually make the sound louder because of the way they affect the vibrations.
If the childen have sung in a tile shower, their voices have seemer louder and fuller because the sounds they made traveled from their throats and bounced off the shower walls. Some things stop the vibrations. Have ready three empty 19oz. Bring one of the water containers to a central location. Put the can-tube in the water.