====== Beat Xylophone ====== {{ :physicsdemos:waves_and_optics:img_6134.jpeg?400 |}} {{ :physicsdemos:waves_and_optics:beat_xylophone_20200410154848.mp4?600 |}} A xylophone with bars that resonate at frequencies increasing sequentially in one Hertz increments is used to generate audible beat frequencies. A microphone and loudspeaker are available for large classes. L3 PIRA DCS 3B60.XX