Here I thought I knew some physics

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Jase2985

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#2676519 18-Mar-2021 15:22

Batman:

Umm... I thought it's the same speed as light

the speed of light is measured in a vacuum, last i checked we didnt live in one of those, so its going to be slightly slower

SaltyNZ

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#2676520 18-Mar-2021 15:23

Batman:

Umm... I thought it's the same speed as light

As @frankv said, in vacuum they are the same speed. In any other media, different wavelengths have different speeds. That's why we have rainbows, why astronomical telescopes use mirrors instead of lenses, and why the longer the distance, the slower the bit-rate has to be.

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ghettomaster

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#2676534 18-Mar-2021 15:31

Thanks for your input everyone. It’s been most informative.

neb

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#2676762 18-Mar-2021 22:34

RunningMan:
Radio waves for the cell network travel a lot faster than sound, which is about 330 m/s. So very roughly takes about 3 seconds for sound to travel 1km. There will be some delay in cell network, but if you are more than say 1/2km away, you will hear it through the phone first.

There's a great video somewhere in Youtube (can't reference it, sorry) of someone running up an old Chrysler air raid siren a long way away. You can hear it run up over a cellphone and then run down again. The guy puts the cellphone down and after a pause you can hear the same run coming through the air, it's a pretty amazing delay.

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