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Thread: HOW DOES RADIATION TRAVEL?

  1. #1 HOW DOES RADIATION TRAVEL? 
    Forum Freshman ADAMA's Avatar
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    I think it travels through the air?


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  3. #2  
    Forum Freshman ASTROPHYSICIST137's Avatar
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    all radiation travels via photons.


    K.T.B
    Men speak of killing time and yet, time secretly kills them....
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  4. #3  
    Forum Masters Degree Numsgil's Avatar
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    All EM radiation travels via photons.

    But other types of radiation, such as alpha and beta radiation, are actual particles of matter.
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  5. #4 Re: HOW DOES RADIATION TRAVEL? 
    . DrRocket's Avatar
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    Quote Originally Posted by ADAMA
    I think it travels through the air?
    It travels quite well through the vacuum.

    Even when it travels through a medium it is traveling through the vacuum

    Electromagnetic (EM) waves are really a bunch of photons. When an EM wave travels through a material medium what really happens is that the photons travel through the vacuum between atoms, encounter electrons, are absorbed, are re-emitted and them travel through the vacuum again.

    Radiation travels quite well through the vacuum of space. If it didn't you would not be able to see stars.
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  6. #5  
    Time Lord
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    You almost might as well ask how gravity travels. All EM radiation consists of is a changing magnetic field (changing from the perspective of the observer).

    If there were a wire with a powerful electric charge 100 meters away from you, and it suddenly got yanked another 50 meters away, the change in how much it affected a piece of metal you were holding would wait to happen until (The speed of light)/(100 meters) time later.

    That change, and EM radiation, are exactly the same thing. You can generate a radio wave just by moving a charged object around. It won't be a very strong radio wave... mind you.
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