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Thread: light and sound(yeah i know, back to the 1900s...)

  1. #1 light and sound(yeah i know, back to the 1900s...) 
    Forum Ph.D.
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    well, sitting around here, pondering and such, as i usually do,
    i think about the similarity of light and sound.
    so i start researching why sound a light are not the same thing,
    and then i remember that einstein made electromagnetic radiation and soundwaves incompatible, by abolishing the æther.
    but still... its nagging me.... it seems so beatiful and perfect.

    human hearing goes from 20hz, to 20 000hz.
    sound makes your eardrums vibrate by displacing molecules, and in space, there is no sound, because theres nothing soundwaves can move through.

    electromagnetic radiation starts at about 1 million hz for radio waves.

    light, being wave-particles, moves through the universal vacuum with no problem at all.
    does all electromagnetic radiation move at the speed of light?
    can all electromagnetic radiation move through space?
    what is the frequencies below radiowaves?


    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
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  3. #2  
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    from http://en.wikipedia.org/wiki/Electromagnetic_spectrum

    γ = Gamma rays
    HX = Hard X-rays
    SX = Soft X-Rays
    EUV = Extreme ultraviolet
    NUV = Near ultraviolet
    Visible light
    NIR = Near infrared
    MIR = Moderate infrared
    FIR = Far infrared

    Radio waves
    EHF = Extremely high frequency (Microwaves)
    SHF = Super high frequency (Microwaves)
    UHF = Ultra high frequency
    VHF = Very high frequency
    HF = High frequency
    MF = Medium frequency
    LF = Low frequency
    VLF = Very low frequency
    VF = Voice frequency
    ELF = Extremely low frequency

    Yes all electromagnetic radiation goes through space at the speed of light. The ELF is the lowest frequency band listed. It's used for submarine communications.


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  4. #3  
    Forum Ph.D.
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    currently reading this page,
    which lists some of the sources of electromagnetic radiation.

    http://www.krysstal.com/spectrum.html
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
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  5. #4  
    Forum Ph.D.
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    hmm, ok, didn't know the electromagnetic spectrum, actually stretched below the frequency range of sound.
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
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