What is this sound on iPhones?

I don't know if anyone has noticed this until now

there is a very small sound at the top of the phone when you let it go with the screen down on the bed for example

that is, you put the phone in a vertical position and let it fall on the bed with the screen down

you can hear this sound as if something is broken

on all the apple phones I've had, they all sounded like this

it can be heard even on iphone 14 pro max and the phone is new

Can someone please tell me what this could be?

[Re-Titled by Moderator]