Because many videos throw a lot of information too fast and don't give enough time for the reader to digest it, or, they don't go too deep and the pretent you already know deep concepts.
Amazing ! Education of such high quality in the 50s . Meanwhile, even with advancement of technology in the present age , I cannot find a better explanation of how reflecting dipoles work.
These guys digested the subject well, so that the viewer can easily absorb it. The focus was on education - not entertainment - Its better not to mix them. Thank You! - no flash - no gimics - no cool camera work - no techno music - no need
I love this video! The pace, the verbal explanation, and the music (so good)! I really appreciate the thinking time with respect to the simple animation. It is so minimal in that there are no variables written on the screen, that it actually becomes more understood through the perception of the spacial relationships presented. Thank you.
The ruby rod in a conventional laser is cut so that its length is close to the wavelength of the output light, plus one quarter of that wavelength. The internal surfaces reflect the energy back toward one another, much like the example shown at 6:00. Since both surfaces are reflective, there is a "hall of mirrors" effect, simulating an array of many, many reflectors. In this way, the ruby rod creates an array of waves that, through interference, produce a strongly unidirectional propagation of energy.
hi, My name Hang, i'm Vietnamese and i am a student.I can not hear what he say, so can you help me make subtile? Can you Write it by English? Thank you so much if you can help me.
This is so awesome, and it makes total sense how the reflectivity works. In the previous video, it explained how only the E field reverses when it hits a surface, while the H goes unchanged. And then having the distance a 1/4 wavelength away to phase it properly with the oncoming wave, so it reflects at the right time, is so simple and yet so neato! Haha. I love these old videos. No distracting music, no superfluous words or paragraphs (honestly, having to read and listen to something else you are saying verbally, and at the same time, is like phase cancellation for my divided attention).
Paulo Constantino Yes. I believe the orbital patterns emerge from standing waves in the electrical field around an atom. So it’s not surprising to find some similarities there.
Are they really (on average) more clear than the equivalent today? Or is it just that people only dig up and replay the cream of the crop so we get a sort of 'survivor bias'?
Muy bueno. Las imágenes gráficas ayudan mucho al entendimiento de una temática que en un principio puede resultar complicada. Es una maravilla de la ingeniería/ciencia
This was very interesting but I'm seeking an answer to a specific question. I'm an older man who grew up when everyone used an antenna for TV. The roof antennas were best but indoor antennas existed too. Indoor antennas had to be made of metal, and those rods had to be able to change size. You could also add some aluminum foil to the antenna to make it work better. Today I use an HD indoor antenna but if it isn't working well on a given night often if I touch it that will help. It's as if my body becomes part of the antenna. I can't understand why these new antennas are helped by flesh & blood, instead of metal? Furthermore, I was taught radio waves don't change. What are today's HD antennas made of?
Is it just me, or do these cheesy old videos work so much better than the current crop of people talking incoherently at 100 words per minute at the screen?
6:19. 1/4 wave space reflector in reality works, but is slightly too far spaced. It should be slightly less than that, close to 1/5th wave. Smaller spacings work too such as 1/6th wave.
Vintage military training films are a wealth of easy to understand information. Like the Albert Einstein quote, "If you can't explain it simply, you don't understand it well enough."
Is the power of a directed transmission the same as that of an undirected transmission (using the same transmitter without the passive thingy)? Since directivity relies on interference i would expect yes but from what ive read the gain of a directional antenna is greater
