Ash
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Ash asked in Science & MathematicsPhysics · 9 years ago

Sound does not travel through a vacuum. How do we know that light does?

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  • 9 years ago
    Favourite answer

    well, sound is actually (to humans) the variation in the air pressure that happens rapidly. To be audible, the change in that pressure needs to be 20 times a second to about 20000 for humans, thats the frequency. A speaker vibrates the air and we hear a sound. i.e. the sound needs a medium. so, it cannot travel through vacuum.

    the light though (photons) are energy packets. they do not have mass. just a bundle of energy "yaaay!!" ing wherever they want to go. they do not need medium to travel. Massless=freedom!!! :D

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  • 9 years ago

    Space is obviously a vacuum, or else sound would travel through it. Given this, at any given moment, a person on Earth at night can look up and see the billions of stars in the universe. Light, thus, travels through a vacuum to reach our eyes-however many years later!

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  • Anonymous
    9 years ago

    Because we can see the sun, and there are 93 million miles of vacuum between us and the sun.

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  • Anonymous
    9 years ago

    take a vaccum belljar try to produce sound through it.it won'tas they are longitudinal waves

    try to pass light it will pass as they are transvese waves

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