Acoustics Hall Introduction: The exhibition hall introduces the basic principles of acoustics and its interesting characteristics. The foam beads in the standing wave exhibit dance with the music as the speaker vibrates the air, showing the peaks of the standing wave. When the frequency of the sound coincides with the vibration frequency of the dancing ring, resonance will occur and the ring will beat. Visitors can play beautiful music by waving their palms on the electronic circuits of magical music and changing the vibration frequency of the circuits.