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The unexpected noise of ice being dropped down a long and dark bore hole in an Antarctic glacier
As it plunges down the 90metre hole, notice the noise culminating in a very unusual ping sound then a more ominous, heartbeat-like rhythm... 1/
As it plunges down the 90metre hole, notice the noise culminating in a very unusual ping sound then a more ominous, heartbeat-like rhythm... 1/
And it’s the same every time! 2/
3/ many things going on...
As the ice falls, the pitch of the sound changes.. this is called the Doppler effect. Sound waves from a moving source change in frequency (and therefore pitch) as they pass.
Imagine car , sounds different coming towards you and moving away
As the ice falls, the pitch of the sound changes.. this is called the Doppler effect. Sound waves from a moving source change in frequency (and therefore pitch) as they pass.
Imagine car , sounds different coming towards you and moving away
4/ different frequencies are travelling at different speeds. The high frequencies travel fastest and get to the top first.. for a more in-depth explanation here’s an amazing article.
https://cutt.ly/hg1Mxlu
https://cutt.ly/hg1Mxlu
Acoustic dispersion is pretty phenomenal just incase you missed this example ... https://twitter.com/gunsnrosesgirl3/status/1306152040909942784
