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B When photons from distant stars [etc] are received, what about the rest of the EM spectrum?

  1. Nov 29, 2018 #1
    When photons from distant stars [etc] are received why does the rest of the electromagnetic spectrum not reach us.
     
  2. jcsd
  3. Nov 29, 2018 #2

    PeroK

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    What makes you think it doesn't?
     
  4. Nov 29, 2018 #3

    A.T.

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  5. Nov 29, 2018 #4
    In comparison to radio waves (in general) it's usually the opposite because interstellar and intergalactic materials (powders, etc) are transparent to radio waves but not always to visible light.

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  6. Dec 5, 2018 #5
    Am I missing something, but aren't photons the carrier of all electromagnetic radiation regardless of frequency? So they're all being emitted, some are absorbed or transduced along the way, but a lot reaches us. We view the cosmos in many frequencies right here on Earth.
     
  7. Dec 5, 2018 #6

    davenn

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    No they are not.
    EM emissions is mostly frequency specific .... eg. monochromatic light .... a red laser ... is very frequency specific radio, TV broadcasts ....
    else why would they bother to give you a specific frequency to tune to for your favourite FM radio station eg. 101.7 MHz
    Some sources are broad band, but even then not necessarily/not likely to be right across the whole spectrum

    ohhh and photons are quantum packets of energy (at a specific frequency) :smile:
     
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