把冰块丢到南极钻洞里的声音

有意思。视频下面的一条评论：

"After the ice chunk hits the bottom of the borehole, you can hear a “ricochet” noise, which is caused by the slightly different ways the sound from the impact propagates back up the borehole. The acoustic wave for the “heartbeat” impulses travels straight up the borehole, while the other sound waves bounce back and forth off the side-walls of the borehole on their way up. This causes different frequencies to travel at different speeds. The high frequencies travel fastest and get to the top first while the low frequencies lag behind and arrive later."

Source: https://www.rochester.edu/newscenter/why-does-ice-make-that-sound-314912/

DeepL翻译（有修改）：当冰块撞击到钻洞底部后，你可以听到“跳弹”的声音，这是因为撞击产生的声音从洞底传播到洞口时方式特殊。“心跳”脉冲的声波在洞中直线传播，而其他声波则在上升途中在钻洞的侧壁上来回反弹。这导致不同的频率以不同的速度传播。高频的传播速度最快，最先到达顶部，而低频的传播速度滞后，较晚到达。