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DanielleFong's profile
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@DanielleFong

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Empire of the Future
Joined February 2008

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    1. Robert McNees‏ @mcnees 15 Aug 2020

      Planck had assumed that the idea of quanta was probably a convenient way of representing unknown physics governing the interaction of light and matter, rather than a property of light itself. Einstein had showed that, in fact, quanta are real.

      1 reply 0 retweets 18 likes
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    2. Robert McNees‏ @mcnees 15 Aug 2020

      So more than 100 years after Young had conclusively demonstrated the waviness of light, Einstein showed that light of frequency f must carry energy in indivisible bits of size hf. Here, h is "Planck’s constant": 6.626 x 10⁻³⁴ J·s. This is a very particle-y behavior for a wave!

      1 reply 1 retweet 21 likes
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    3. Robert McNees‏ @mcnees 15 Aug 2020

      But this is just how nature works. Light exhibits some wavy behaviors and some particle-y behaviors. There's nothing to reconcile, it just seems odd to us because our inutition, based on living in the macroscopic world, tells us that “particle" and “wave" are orthogonal concepts.

      1 reply 2 retweets 23 likes
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    4. Robert McNees‏ @mcnees 15 Aug 2020

      Our intuition is great for baseballs and waves at the beach, but there’s no reason that it should extend to the subatomic world. There’s nothing weird about “wave-particle duality.” Nature is what it is. Anyway, back to de Broglie.

      1 reply 1 retweet 25 likes
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    5. Robert McNees‏ @mcnees 15 Aug 2020

      Since light, our canonical example of a wave-y thing, can have particle-y properties, de Broglie suggested it might also work in the other direction. That is, perhaps something like an electron might occasional exhibit behaviors we associate with waves?

      1 reply 0 retweets 19 likes
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    6. Robert McNees‏ @mcnees 15 Aug 2020

      In special relativity, a massless particle like the photon has momentum p = E/c. And its energy at frequency f comes in these E=hf chunks. Since the speed of light is c = λ*f, we can rearrange all that to get λ = h/p.

      1 reply 0 retweets 17 likes
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    7. Robert McNees‏ @mcnees 15 Aug 2020

      So de Broglie proposed that a particle with momentum p should have an associated wavelength λ = h/p. A few years later, in 1927, this was confirmed in electron diffraction experiments by Thomson, and independently by Davisson and Germer.

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    8. Robert McNees‏ @mcnees 15 Aug 2020

      This led to a Nobel Prize for de Broglie in 1929, and for Thomson and Davisson in 1937. A lovely little twist is that Thomson’s father J.J. Thomson is credited with discovering the electron. Essentially, father showed that it was a particle and son showed that it was a wave.

      1 reply 3 retweets 32 likes
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    9. Robert McNees‏ @mcnees 15 Aug 2020

      Demonstrating the wave properties of matter is easiest for electrons; their small mass means a small momentum and hence a large wavelength. But it has since been shown for neutrons, atoms, and entire molecules.

      1 reply 0 retweets 17 likes
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    10. Robert McNees‏ @mcnees 15 Aug 2020

      Here, a team from Vienna observes the diffraction of C₆₀ molecules! https://www.nature.com/articles/44348 

      3 replies 1 retweet 16 likes
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       🤷🏻‍♀️‏ @DanielleFong 15 Aug 2020
      Replying to @mcnees

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      8:14 AM - 15 Aug 2020
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