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LightNmatter
เข้าร่วมเมื่อ 15 พ.ย. 2020
Formation of Rainbows Part 1 (Preliminary draft, unedited version)
This is the first part of a two part video explaining how rainbows form in greater detail, using physical demonstrations and animations. This is very preliminary, and incomplete. I started making this a while ago, but now for more than 3 years did not get to do any work on it, . Since I am not sure when I will be get back to it, I am posting this draft version. It is bit longer than I would like, and mostly unedited. Hope you may still find something useful and interesting. Hopefully I will be able to finish it someday.
มุมมอง: 74
วีดีโอ
Polishing with pitch lap
มุมมอง 412 หลายเดือนก่อน
Polishing with pitch lap, to get rid of zones created by pad polishing and to get a spherical figure.
Grinding a 20 F3.8 inch Newtonian Primary mirror : Part 2
มุมมอง 96ปีที่แล้ว
Rough grinding with silicon carbide #80 to F3.8. The mirror blank already has a F4.5 generated curve.
Grinding a 20 inch F3.8 Newtonian primary mirror : Part 1 Beveling the edge
มุมมอง 144ปีที่แล้ว
Beveling the mirror blank edges before start grinding. I first tried a diamond cut off disk, it was fast, but the edge was rough. This (I guess Alumina) cutoff wheel made a much smother edge.
Views through a replica Galileo telescope. Part 2 - Planets and the Sun
มุมมอง 2.3Kปีที่แล้ว
Galileo built his first spyglass (telescope) in the Summer of 1609 which was an improvement over the spyglass available from eyeglass makers. By December of that year, he had built a telescope with magnifications up to 30 times and started doing systematic observation of celestial objects. Through his telescopes, Galileo observed the Moon, Jupiter, Venus, Saturn, sun, and stars and made many di...
Views through a replica Galileo telescope. Part 1 - The Moon.
มุมมอง 3.2Kปีที่แล้ว
Galileo built his first spyglass (telescope) in the Summer of 1609 which was an improvement over the spyglass available from eyeglass makers. By December of that year, he had built a telescope with magnifications up to 30 times and started doing systematic observation of celestial objects. Through his telescopes, Galileo observed the Moon, Jupiter, Venus, Saturn, sun, and stars and made many di...
Hertz's discovery of the photoelectric effect.
มุมมอง 5313 ปีที่แล้ว
For more details visit the channel web page: www.lightnmatter.net During his radio experiments Hertz noticed that when something is place in between spark of the emitter (primary spark) and spark gap of the receiver (secondary spark) , receiver sparks become shorter (ie. receiver spark gap had to make narrower for sparks to occur). Investigating this he finally nailed down that ultraviolet ligh...
Hertz's radio wave discovery experiment
มุมมอง 9243 ปีที่แล้ว
For more details visit the channel web page: www.lightnmatter.net In this recreation of Hertz experiment, radiator (transmitter or generator ) closely resembles what Heinrich Hertz used to generate 'electric waves' in his 1892 experiment which let to the discovery of electromagnetic waves thus confirming Maxwell's electromagnetic theory. It is a basically a high frequency LC oscillator. Plates ...
Surfing on sound waves
มุมมอง 1683 ปีที่แล้ว
A standing sound wave has alternate regions where air density/pressure fluctuations and nodal points where density does not change. In this demonstration small styraform balls are place in a vertical sound standing wave. Styraform balls are then locked into nodal points and floats. Here the standing wave is generated by reflating sound waves from a piezoelectric transducer reflected from an alu...
Schlieren imaging Part 4: Sound wave diffraction
มุมมอง 4753 ปีที่แล้ว
IN this video of Schlieren imaging of sound waves, an obstacle is placed on the path of the wave. Since wave length is considerably large (15.9 mm) the wave bends over the edge - diffraction.
Schlieren imaging Part3 : Viewing continuous sound waves
มุมมอง 7473 ปีที่แล้ว
To view propagating waves one has to capture images at an extremely fast to see any wave (in few millionth of a second or so). Here instead the tester light is strobed at the same frequency (or very close to) as the sound frequency, thus freezing the image to strobe. Slightly changing the strobe frequency the wave can make to appear moving forward or backward. Just an illusion due to stroboscop...
Schlieren imaging Part 2 : Standing waves of sound
มุมมอง 5773 ปีที่แล้ว
Since sound is a wave of density fluctuations, they are visible in the Schlieren image. Easiest to capture are standing waves. Here a piezoelectric ultrasonic transducer driven by a function generator and amplifier generates sound waves at its resonance frequency 21.5 kHz. An aluminum plate is placed few centimeters in front of the transducer to reflect sound waves and generate standing waves. ...
Schlieren imaging Part 1 : Thermal currents
มุมมอง 2173 ปีที่แล้ว
In this video Schlieren imaging is used to view convection currents from hand and a cup of cool water. In Schlieren imaging (or the Foucault test when it is used to test optical surfaces), a spherical mirror is used to from an image of a point light source placed close to its radius of curvature. If the mirror is truly spherical and the air is uniform image thus formed is a point image. When a ...
Properties of waves - a ripple tank demo
มุมมอง 17K4 ปีที่แล้ว
A home built ripple tank is used to demonstrate the basic properties of waves: Doppler shift, interference and diffraction. Visit www.lightnmatter.net for more details. Subscribe, comment and share!
good work but speak with a bit more confidence
Admiro a Galileo con un pequeño telescopio hizo maravillas
I haven't watched the video but you probably got Derecked
That is so cool!!!
nice video!
Hi! I also now polishing 16". According to you video 0:23 I see TDE.
Yes it has TDE also some astigmatism , lot more work ahead.
@@lightnmatter if you interest I upload my result of fix. post polishing www.youtube.com/@oleggerashchenko2201/community
Jupiter moons through ancient telescope are incredible!!
I see them with my small binoculars too 😂
I'm trying to do a setup like this. I have the Schlieren setup perfect- good mirror, works fantastically for heat and density demonstrations. But I can't get sound waves to appear at all. I am using a little Bluetooth speaker with a face of about 3x3 inches square. Do I have to use a transducer like you've got here? Or do you think I can change my speaker into a sort of point source? Please let me know your thoughts. Thank you!
Also, I have a stroboscope set to the same frequency of the sounds I am producing. The stroboscope can go up to 16,666 Hz. I'm using a high-quality camera and have excellent optics. Still no effect.
I am not sure about speaker would work. Ultrasonic speaker worked better because its sound beam concentrated is less diverging. Strobes have to be exactly synchronized to the sound pulses, otherwise it won't work.
@@lightnmatterThank you, I will try different sound sources.
What is the diameter of the lens?
Is possible to photography with galilein telescope
amazing! Imagine how mind blowing this must have been for him.
Your spark gap turns on and runs reliably. What do you use for an interrupter in your spark gap circuit?
i think that the low quality security camera made it more realistic because its almost like looking through his lower quality lenses. thanksfor the video!
Imagine if he could've seen James Webb
it would be enough of something like modern 10" Dob for wow effect )
100th subber :D
Amazinh
wow 3in1
Really nice stuff! Thanks! In our standard wave model, the energy of a wave is proportional to the square of its amplitude. If the amplitude is doubled, then the energy is quadrupled. But the superposition principle says the overall amplitude is the simple addition of the waves. If two waves are identical, then the superposition will give us a combined amplitude of 2 times. So from 2 parts of energy (1 part from each wave), we get 4 parts of energy(this comes from the combined wave). If you have the necessary equipment, could you please validate the superposition principle?
Thanks for the demo! For the detector head, can we use thin pins instead of balls?
Balls add some capacitance to the receiver loop (it is basically a LC circuit). Pins would work, but the loop size would be different to get optimal sensitivity.
@@lightnmatter thanks
This is Hiranthi. I was surprised by the comparisons of the video of present day moon and the drawings of Moons by Gallileo. It hasn't changed! When all the matter and objects are subjected to change, how come the moon did not change? Maybe there are subtle changes, which are not clearly shown in the video?
Changes happen over time scales of millions of years, besides the moon has no atmosphere, so there is no rain wind, or other weathering activity like on earth to change its surface, the moon is also geologically stable due to its inner structure, not much tectonic activity, volcanos or moon quakes.
@@lightnmatter There have also been a bunch of new but very small craters added to the multitude that are already there, so it's not very noticeable. The really big impacts are rare, and most occurred billions of years ago anyway, when there were many more comets and asteroids around (and when the Moon wasn't tidally locked, so the face we're familiar with today was more exposed to impacts).
perfect replicas, just WoW!
The views on this are better than the Jason Empire department store 60mm refractor I had as a kid.
Great video!
Excelent! Thanks
Is a strobe light used in this setup?
No, standing waves are not moving, so no need for a strobe.
@@lightnmatter Thanks! I wanted a second opinion before I told someone that.
Girl YES!!!! I PUT THE VIBRATING DIPPER DEEP INSIDE MY VIRGINIA AND SQUIRTED JUST ENOUGH WATER TO FILL THE TANK 😍😍😍😘😘❤️😍😍
Best video about wave properties on youtube!
❤❤
Nice man
Your experiments are very good!!!
Excellent !!!!! Thanks!!!
Thanks you for making me feel physics
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absolutely wonderful, thanks
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