Comments on: That’s About the Size of It https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/ Brian Koberlein Thu, 21 Feb 2019 15:22:39 +0000 hourly 1 https://wordpress.org/?v=5.0.3 By: S. BURO https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6394 Sun, 27 Jan 2019 18:09:37 +0000 https://briankoberlein.com/?p=4694#comment-6394 So, the real answer is left to my IMAGINATION,,,PERFECT,,,MY IMAGINATION IS HUGE AND FASTER THAN THE SPEED OF THAT PHOTON,,,

]]> By: John David Dunson https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6332 Sat, 15 Dec 2018 03:50:04 +0000 https://briankoberlein.com/?p=4694#comment-6332 um, actually, it would be five ten-thousandths of a millimeter.
https://imgur.com/a/KEM86VN

]]> By: John David Dunson https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6331 Sat, 15 Dec 2018 03:26:34 +0000 https://briankoberlein.com/?p=4694#comment-6331 light does not have an amplitude. or rather, it’s always the exact same amplitude. the only way to change the amount of energy in light is to change its frequency, or change how much of it there is. so when people say light has an amplitude, it’s really just a matter of how many photons there are. more photons will make it brighter, seeming like a larger amplitude, but it’s just a lot of light at the same regular amplitude.

]]> By: John David Dunson https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6330 Sat, 15 Dec 2018 03:15:07 +0000 https://briankoberlein.com/?p=4694#comment-6330 electromagnetic radiation is sort of like a magnetic field. higher frequencies have smaller (more concentrated) fields, so they can pass through smaller openings. imagine a very strong magnet trying to pass between other magnets… then a weaker magnet trying to pass through the same space. it’d be much easier for the weak magnet. even though nothing ever touches, the fields are repelling them. if you know that higher frequencies actually have more energy, it might seem counter-intuitive that they can pass through smaller openings. but what’s really happening is that the larger weaker wave gets disrupted when its edge gets too close to the mesh. the smaller, more energetic waves, are less affected by it.

]]> By: Hamayoun khan https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6250 Wed, 03 Oct 2018 19:21:37 +0000 https://briankoberlein.com/?p=4694#comment-6250 if we will say that the energy of photon depend on it,s density and size of photon will it be corect
or if not so why someone explain this please

]]> By: EntangledParticle https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6120 Sun, 03 Jun 2018 15:18:53 +0000 https://briankoberlein.com/?p=4694#comment-6120 Dear Brian, this post helped clear some doubts but I am still a bit stuck on this idea of cross-sectional area of a photon. I am taking a course on Astrophysics on edX and came across this idea while learning about the behavior of photons when the Universe was a plasma and photon interaction with electrons kept scattering them before the Recombination period occurred. There is a nice set of lectures by Alan Guth on MIT’s opencoursweare on Astrophysics where this idea was once again mentioned. What I want to ask is where can I read up more about this in depth? I am okay with the undergrad maths and physics of the topic and being a self-learner, it would help give me a direction to navigate the course that I am taking. Also, and I may be mistaken here because this is my first visit to your site, could you please add links for further reading on the topics you write about. It would give a more expansive idea on the topic for people who want to pursue it on a deeper level. Again, my first visit here so may be you already do that and I have missed it. In that case, my mistake. 🙂

Thank you for this creating this brilliant site!

]]> By: Larry https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6094 Mon, 07 May 2018 11:59:50 +0000 https://briankoberlein.com/?p=4694#comment-6094 I see double quotes, not sixes or nines. It may be the font chosen in your browser that has assigned the wrong characters to the code. ASCI fonts should work. Unicode should also work if the characters in your font have been correctly assigned.

]]> By: Sean https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-6030 Sun, 01 Apr 2018 18:59:04 +0000 https://briankoberlein.com/?p=4694#comment-6030 Thank you very much, Brian. I have an undergrad degree in electrical and electronic engineering. This has remained an obvious question but never came up in the context of engineering application. Your practical answer is very much appreciated.

Similarly, what us the length of a photon?

We were introduced to the Schrodinger equation and quantum in physics, I can only infer that the wave packet probability function best defines the length. As well, it seems that the photon does not have a strictly singular wavelength but rather a bandwidth, this being the only way, at least in description, that the pulse shape can be obtained as it is typically depicted. So, this paragraph is really a question.

]]> By: lmalm https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-5962 Tue, 13 Feb 2018 04:46:40 +0000 https://briankoberlein.com/?p=4694#comment-5962 “Large radio telescopes are not solid dishes, but rather an open mesh. This is largely done to save on weight, since the dish doesn’t need to be solid to reflect radio waves”

It is also done because (1) solid would be far more expensive (2) there is no need for solid (3) wind loading would be much different with a solid “dish” of this size…

]]> By: Brian Koberlein https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-5821 Sat, 06 Jan 2018 16:05:14 +0000 https://briankoberlein.com/?p=4694#comment-5821 That’s not quite how it works.

]]> By: Juan Carlos Saavedra https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-5820 Sat, 06 Jan 2018 03:40:47 +0000 https://briankoberlein.com/?p=4694#comment-5820 A very interesting subject, when an object is and reflect color green iluminated with white light, the electrons in the object will reflect only the green part of the white light of the spectrum by going to a lower orbit around the nucleus, since this orbit is shorter the electron loose energy by emiting a green photon into space telling Us that the object is green.

]]> By: Harsha Kumar Suriyaarachchi https://briankoberlein.com/2015/04/14/thats-about-the-size-of-it/#comment-5688 Thu, 16 Nov 2017 18:12:05 +0000 https://briankoberlein.com/?p=4694#comment-5688 Wave length is in the same direction of the movement of the wave. Size of the microwave mesh opening is in the transverse direction. How come a wavelength be the barrier to go through an opening in a transverse direction?

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