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  • Jeffrey Arulraj
    Jeffrey Arulraj

    @jeffrey-xA7lUP • Sep 24, 2012

    In many ways it serves as a path between the trans and reciever ckt

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Sep 24, 2012

    Communication is by electromagnetic waves. They do not need a medium. All satellite communication is mostly through the vacuum of space.
    However sound waves do need a medium. These are longitudinal waves in contrast to the transverse electromagnetic waves above.
    <a href="https://www.physicsclassroom.com/class/sound/u11l1c.cfm" target="_blank" rel="nofollow noopener noreferrer">Physics Tutorial: Sound Waves as Pressure Waves</a>

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