Science Buddies: "Ask an Expert"

Hi
Odd question, i slo mo videoed these 2 hematite magnets crashing together, interesting as they clicker more quickly and at a higher pitch the is a strange (normally inaudible)crashing sound in the vid, like thunder..
Anyone experienced this or have any ideas what the cause is?
I can’t upload the video but it’s easy to recreate

Hi,

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A. Norman