The video shows the middle part of a sound. Which instrument made it? リコーダー オーボエ ハープ Sounds can be recorded and translated into wave shapes on a computer, then analyzed, cut apart and played forward or backward. Recorder The video shows a sound being played backwards. Which instrument made it? ピアノ バイオリン ハープ Some sounds are very different when you only hear part of them, or play them back to front. Piano The video shows a sound from a small Rijke tube, how will a big Rijke tube sound? 高い 低い 同じ The sound waves have more room to wobble around inside the big tube than inside a small one, producing a lower sound. Lower Will a bigger 'Clucking Bucket' sound higher or lower than the Clucking Cup in the video? 高い 低い 同じ Frequency is the number of times a sound wave wobbles back and forth in a certain period of time; longer vibrations from a bigger instrument produces lower frequencies. Lower Your heartbeat after running on the spot (running in place) is most like the beat of: 子守唄 ディスコ・ミュージック スロー・ダンス Like your heartbeat, the beat in music stays steady but can be slower or faster depending on the tempo, which is measured in beats per minute. Disco Music