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From: "Paul.B.Andersen" <relativity@paulba.no>
Newsgroups: sci.physics.relativity
Subject: Re: 1. On the notion of simultaneity in special relativity
Date: Thu, 29 Aug 2024 14:27:02 +0200
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Den 29.08.2024 13:32, skrev Richard Hachel:
> 
> If I could send a sound along a metal bar from here to the moon (a bar 
> 3.10^8m long for example). The sound itself would not be constant 
> according to the longitudinal direction of travel.


If we ignore the fact that your scenario as always is impossible by
a number of different reasons:

The speed of sound in a steel rod is ca. 5 km/s in both directions.
T ≈ 3e8/5e3 s = 60000 s = 16.7 h in either direction.


> It would be faster in the return direction. And vice versa for a lunar 
> observer.
> 

-- 
Paul

https://paulba.no/