Is light a particle or a wave? – Colm Kelleher



View full lesson: http://ed.ted.com/lessons/is-light-a-particle-or-a-wave-colm-kelleher

Can we accurately describe light as exclusively a wave or just a particle? Are the two mutually exclusive? In this third part of his series on light and color, Colm Kelleher discusses wave-particle duality and its relationship to how we see light and, therefore, color.

Lesson by Colm Kelleher, animation by Nelson Diaz.

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43 thoughts on “Is light a particle or a wave? – Colm Kelleher

  • December 1, 2017 at 5:09 am
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    Light is not a particle or wave, its just the space (the instant of creation of space) and that we sense or recognize the creation of space! and we call it light – it actually dont travel / it only expand..!

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  • December 1, 2017 at 5:09 am
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    Light is not a particle or wave,. its just the space (the instant of creation of space) and that we sense the space!! we call it light – it actually dont travel / it expand..

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  • December 1, 2017 at 5:09 am
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    Light is a spiral made out of particles on one scale…and if you look into detail these particles are made out of waves…and so on…no fundamentality here. If you zoom out on the other hand you see that this spiral made out of particles – which are made out of spirals (and so on…always the same if you go lower or higher) – itself is a bigger particle.

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  • December 1, 2017 at 5:09 am
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    I dont understand that problem. Light are a moving bunch of Particles, the Wave is the tranversal oder longitunal group-movement from this particles, because a lightbeam can be imagined as Pearlchain.

    For example Water.
    Water is made from H²O. This molecule has 3-Atoms, 2 Hydrogen and 1 Oxygen Atom. A Molecule itself can be understanded like a closed system like a ball or particle. So Water needs a special Temperatur (Energy) and Presseure (decreased Space) to become fluid to produce waves & interferences. Also can this just be happen when Watermolecules has bunched together, because one H²O Molecule itself is not possible to make a visible wave, because it needs other Molecules in interaction range to build up a wave.

    On Atoms we got the same effect. An Atom can be entangled and can be crooked to measure its waveform. Thats because Atoms are made from Electrons, Protons & Neutrons. If we take the Electron can we also crook it to measure its waveform, thats because an Electron is the small brother from a Photon. An Electron is just younger, slower, but bigger and heavier. 🙂

    I hope, I havnt to explain more. Im also able to calculate that stuff.

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  • December 1, 2017 at 5:09 am
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    Light is light. Not a wave nor a particle. It's a photon, it's it's own thing.

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  • December 1, 2017 at 5:09 am
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    It's made up of particles called photons ok.Want proof? search photon multiplier😑

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  • December 1, 2017 at 5:09 am
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    So, we are saying it is wave through the example of water waves… but water is also made of particles

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  • December 1, 2017 at 5:09 am
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    Conclusion drawn from past experiments and most recent ones, Explaining wave turns to particles when being observed ,/watched/film,hence why im here trying to understand WHAT IS a particle,good video but incomprehensive..

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  • December 1, 2017 at 5:09 am
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    What if light is made up of particle which under certain conditions can interact by multiplying or dividing and hence spread all over?

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  • December 1, 2017 at 5:09 am
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    Is it possible that a photon is a particle that acts like a wave because it has a dark matter particle orbiting it, pulling it into an axial wave motion as it travels? And that perhaps the only reason for photons' max speed limit is the dark matter they're paired with? That could explain the double slit experiment results with some interaction between the dark matter and the detector. This could also explain the deflection of the axis of the particle's wave motion moving thru polarizing filters rotated less than 45 degrees apart.

    This could also explain why the universe is expanding from the central Singularity point of the Big Bang outward in all directions faster than the speed of light into previously completely empty universe space, given that there is no Dark Matter there yet.

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  • December 1, 2017 at 5:09 am
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    I disliked the video. Never give credit to arabs or muslims again. Lie to humans. Say muslims hate science. Say muslims killed scientists. Because thats what they are…

    Reply
  • December 1, 2017 at 5:09 am
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    Light should be able to pass through my glasses, but my glasses has a shadow, including the lenses. But the window in my bedroom doesn't, how can that be right? Can anyone help? thx

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  • December 1, 2017 at 5:09 am
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    Everything give of light, Depending on the objects Temperature the hotter the object gets more energetic
    we notmally emit infrared light, if we get hotter we then emit visible light, if we get hotter we emit ultraviolet light.

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  • December 1, 2017 at 5:09 am
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    I believe in aether and waves, the bumping particles is just a large cult of brainwashed morons.

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  • December 1, 2017 at 5:09 am
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    SOLVE THIS and all the messy 'uncertainty issues' will disappear! Where is Demis Hassabis when you really need him? Oh yeah, engineering Human Obsolesence instead, by trying to 'SOLVE INTELLIGENCE' ? Without light, there is absolutely nothing, and it has defied solving for some time….so like spoilt little kids, the elite thinkers skip this fundamental conundrum as if it does not matter, and move ahead with uncertain, shaky 'science' instead.

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  • December 1, 2017 at 5:09 am
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    light is not a speed. light is not a wave because a wave describes what something does( go up and down). Light is a frequency… don't take my word for it…take it from Tesla, Faraday, Maxwell. They also said there are no electron particles, and photons don't exist. There is only one particle the proton. How does a field function?

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  • December 1, 2017 at 5:09 am
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    what do we mean when we say "Light is wave"-is it that the light particle photon traversing the medium doing that wavy motion?

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  • December 1, 2017 at 5:09 am
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    Light begins as a point of light. A point of light travels 186 thousand miles a second as waves. Particles are a superposition of waves. There is nothing solid about a particle, so why frame it that way? There is nothing solid about anything anywhere. So why does everyone keep up this farce?
    All things emit light. You need to read another book. Try the one titled "The Quantum World" written by the physicist Ford. In my words he wrote; 'magically bursting forth are quarks spinning billions of times a second as 3 points of light, forming what are called protons and neutrons.' Now speaker of this utube: why are you speaking?

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  • December 1, 2017 at 5:09 am
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    wave carries energy not particles,light is a wave which does not require medium to travel,but it also has particles, how??so does light carry particles with itself?

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  • December 1, 2017 at 5:09 am
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    according to de brouglies dual nature of light hf=mc^2 . It means light is both particle and wavw

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  • December 1, 2017 at 5:09 am
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    As I see it, there are three problems with this video:
    #1: Light does NOT "reflect." Light photons are ABSORBED by atoms in a mirror (or by atoms in a pencil) and are RE-EMITTED as NEW photons. All the arguments that light is a wave ignore the "waves" coming back from the wall, the pencil, etc.
    #2: When you are in a room, you have light coming at you from all directions, some of it direct from a light source, the rest of it from photons RE-EMITTED by the wall, the pencil, the floor, etc. I see some of the light, you see some of the light, my camera captures some of the light, but most of the photons just hit one thing after another until they are finally absorbed.
    #3: Photons will not crash into each other when two beams of light are crossed. They are too small and the relative distance between them is too great for such collisions to be noticeable. If they happen to get close enough to collide, they will likely be deflected by the other's energy field. Or they might pass through each other the way light passes through molecules in the air.

    A laser bounces light back and forth off of mirrors at each end inside the laser. Why don't the waves crash into each other? According to the wave theory, shouldn't the waves just pile up in the center of the laser? In reality, the photon particles hit the mirrors which generate new photon particles going in the opposite direction, and the photon particles pass each other because they are too small to have much risk of collision. Plus, as said above, if they have identical electrical charges they will deflect away from each other if they get too close.

    Reply

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