What are high frequencies and what are low frequencies? And for what they are used for?

SheldonCooper

SheldonCooper

@sheldoncooper-KRWqFp • Oct 26, 2024
Just tell me what are they used for and why in particular (means high freq. for some particular function then why not low frequencies there)? (noise tolerance, propagation through obstacles, ease of transmission or reception, loss ect. ) I don't want too much formulas,wave diagrams and bookish concepts. Just explain in plain school level concept. e.g. At sunrise and sunset, the sun looks red because the low frequencies in the Red Orange etc. can pass the dens distance. Why low frequencies ? Also give some practical examples relating computer science or communication so that there will not be any need to read it again and again to recall the concept. There is one thread on CE having question regarding a particular range and antenna but it's too geeky and contains only one range.
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  • Abhishek Rawal

    Abhishek Rawal

    @abhishek-fg9tRh • Oct 22, 2012

    Hey, Sheldon is a geek, ain't he ?? 😉

    Coming to point, High frequency waves can penetrate the matter easily than low frequency waves.
    Low frequency can travel very long distance ( f=1/T) compared to HF but they usually dies in between propagation. Also as i mentioned before, it cannot penetrate matter.
    So, Telecom Co. uses HF waves to transmit the signals.

    Dude, w/o bookish concepts, theories & formulas "Engineering is not possible".
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  • SheldonCooper

    SheldonCooper

    @sheldoncooper-KRWqFp • Oct 22, 2012

    Yeah he is a Geek. I am not. We just share a common name and a photograph. Not many other characteristics match.😀
    Coming to the point.
    Why high frequency waves can penetrate the walls? What are used in Wifi and satellite communication? Why low frequencies die in between?
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  • Abhishek Rawal

    Abhishek Rawal

    @abhishek-fg9tRh • Oct 22, 2012

    According to plank, E=hv = hc/l.
    l(lemda),As l is high in short waves, Energy will be decreased( Energy & wavelength is inversely proportional).
    So at long distance SWF will fade.

    Again, E=hf as per plank, more the freq more the E. And high E wave can penetrate the matter(conditions applied)
    You can also compare with E=pc.

    Wifi uses RWF.
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  • Jeffrey Arulraj

    Jeffrey Arulraj

    @jeffrey-xA7lUP • Oct 24, 2012

    Rayleigh's law does hold good here for performance
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