Elvith Ma'for

Former Reddfugee, found a new home on feddit.de. Server errors made me switch to discuss.tchncs.de. Now finally @ home on feddit.org.

Likes music, tech, programming, board games and video games. Oh… and coffee, lots of coffee!

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Joined 7 months ago
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  • The earth’s diameter is about 12.700km. that’s 12.700.000m.

    Assuming it were a perfect sphere (it isn’t, but that shold give an estimate), the distance on the surface “to the other side of the world” would be 180°/360°*pi*12.700.000m=19.949.113m - also assuming not using satellite communications.

    Phone signals will either travel as electric fields in copper cables, as radio waves or as light waves in a fiber channel. All cases travel with speed of light c=299.792.458 m/s

    That means, that the time to send the signal to the other end of the world takes about 19.949.113m/299.792.458 m/s = 0,0667s. Now add a few electronic components on there to refresh the signal or transfer it from one medium to another (e.g. the radio tower receiving the RF signal and sending it via fibre out). All of these add a few milliseconds - that’s in the range of 0,001s to 0,01s.

    You usually start to notice that sound is delayed for movies when it’s more than 0,2s delayed - and that’s with the visual cues. While calling someone, you cannot see them which gives even more leeway. So you probably won’t really notice the delay in those calls.