“
また『アルプスの少女ハイジ』の主題歌に使われた『おしえて』という曲の中に「口笛はなぜ遠くまで聞こえるの」という部分があるが、それは口笛が遠くまで届く周波数域で人間の耳がこの周波数域を聞き取りやすいためである。

口笛 - Wikipedia

こんな情報を知ると思ってなかった on Wikipedia
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