What is Light? Maxwell and the Electromagnetic Spectrum


Up until a couple centuries ago, we had no idea what light is. It seems like magic, no? But there is no magic in this world, really. Just stuff we don’t understand. So let’s understand light a little better right now!


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  1. neurobits 30 June, 2020 at 13:34 Reply

    Hi, I’m very confused. Why some say “light particle doesn’t has neutral charge”, when is supposed to be the same exact thing. If I compare transmittion of electric waves over copper vs light over (well, inside) optic fiber, I can catch that maybe because of wavelenght another conductor is needed. But there are other reactions that are different, looks like light can’t give you a shock, but electricity certainly can. Thnx in advance!

  2. Sam Lair 30 June, 2020 at 13:34 Reply

    For those of us who know not yet about the difference between visible light and infrared light, they have a lot to look forward to in learning about how electromagnetic radiation and the greenhouse effect are related and keep the planet from freezing over into a solid ball of ice.
    ‘greenhouse effect electromagnetic radiation’
    ‘greenhouse effect electromagnetic radiation for kids’


  3. UltimateReality 30 June, 2020 at 13:34 Reply

    Wave-particle duality is still unsolved Maxwell didn't believe in electrons or photons I think that everything is a wave and there are no particles matter is a longitudinal wave too like sound

  4. Fat Unicorn 30 June, 2020 at 13:34 Reply

    This is the best explanation that I have seen or heard. Electro magnetic is good but energy frequency will also cover sound.
    What is light?
    Light to us is an electromagnetic energy frequency that most living beings translate into what we perceive as light. All other energy frequencies are darkness to us.
    If Earth has the only living beings in the Universe and our Sun went supernova extinguishing all life, would the universe be light or dark?

  5. bomberathans 30 June, 2020 at 13:34 Reply

    I’m very disappointed, there was so much room for a light 💡 dad joke somewhere in there haha.
    Awesome vid again, Thanks Prof Dave! Science is addictive, or my ocd has nothing else to focus. Either way I’m enjoying learning, bit by bit.

    They way it’s all sectioned out makes your page extremely easy to reference.
    Explain it to me like I’m 4yrs old and we are all good. Love it haha 😂

  6. JesterBear 30 June, 2020 at 13:34 Reply

    Its one thing to describe phenomena, but its another thing to explain it. Which brings me to; What is "waving", and what is the field? Anyone can describe something, but hardly anyone can explain whats actually happening.

  7. Jahira Vasquez 30 June, 2020 at 13:34 Reply

    I wish professor Dave would cite his sources in his youtube vids :,( i always use his vids to write essays for my science classes

  8. Michael Sears 30 June, 2020 at 13:34 Reply

    Make a TV from a record player. Make pitches visual. Like how the radio works or tv. Using the Ma produced by the friction of the needle can create the electricity flowing to the tv

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