Phenomenon Definition and 213 Threads

A light passing through a lens will be focused for a converging lens. However, to look at it carefully, it'll not converge to a single point but to a certain size. The size of it and some fringes surround it is actually a diffraction phenomenon. I don't really understand that the usual...

Hey everyone, I'm in desperate need of help. I need to know how this light/reflection phenomenon is being created: "[URL I've read the description countless times and have experimented a little bit but I can't figure it out. I do have some knowledge in spectrum but clearly not enough...I've...

Hello, guys, I am new here. I'm wondering, what kind of sand should I use to reproduce this phenomenon: http://www.youtube.com/watch?v=X7LpmE9hl-c&feature=related I've tried several kinds of sand, but the phenomenon hasn't observed. What density should sand has? What is the fraction (diametr)...

http://ufopicturesphotos.blogspot.com/2011/09/stationary-ufo-sphere-photographed.html" , has been looking on some of the pictures, but no solid conclusion on what it was has been done so far. There is an animation on the site made by 4 pictures, that shows the object is stationary while the...

This has been aggravating me for years. Call it "IDP" as a placeholder name for now, if you will. How come irrational numbers keep propelling forward for particular divisions? My inquiry applies for both repeating and non-repeating irrational numbers. "Just is" or "You're thinking too much into...

Folks, I watched a movie called 'the rite' with Hopkins. I am intrigued to know what atheists think of this phenomenon. How do they explain the phenomena of speaking a different tongue, precognition, physical violence assuming that the victim has been medically cleared of paranoia dementia...

A bit of unfinished business: I discovered this report back in 2008 and was satisfied at the time that it was legitimate, so I posted it in the UFO Napster - not to be taken as suggestive of anything beyond high strangeness from a seemingly credible report...

Something strange happening here. I'm isolating the beams (which I'm allowed to do) and I get a different result for Dx with each different beam! Check out what happens when I section it at CE, and check out what happens when I section it at AD Homework Statement This structure is made...

Refraction phenomenon! If Light rays fall on a transparent glass then they get refracted! They first get absorbed by the electrons and then to another electron and so on till it emerges out of the glass! But y does the light travel in straight path in the glass itself...how do the electrons...

Capillarity is a phenomenon that only happens in the water? http://courses.soil.ncsu.edu/ssc012/Graphics/watermol.gif http://courses.soil.ncsu.edu/ssc012/Graphics/watermol2.gif [PLAIN][PLAIN]http://courses.soil.ncsu.edu/ssc012/Graphics/capilarity.gif At left, the water colunm is minor...

Can anybody suggest good reading material, introduction or review articles on this subject? (I read and studied Carroll GR lecture notes, so everything at this level or below would be great.) thanks

Homework Statement http://img684.imageshack.us/img684/4496/fourier.png Homework Equations http://en.wikipedia.org/wiki/Small-angle_approximation The Attempt at a Solution This is part of a larger question, I have underlined in Red the areas I am struggling with and have cut out...

Can anyone give me a source where i ca completely ready about the electrical phenomenon in transformers like the terminology, single phase , 3 phase transformers and then torque and mef production ?? a textbook was prescribed to us in college but it really contains a lot of mistakes and makes...

I happened upon this and had to check it out. Sure enough, it seems that we really can be so scared that we sweat blood. http://en.wikipedia.org/wiki/Hematidrosis#cite_note-0 http://www.ncbi.nlm.nih.gov/pubmed/8982961 Berkeman is still at the helm but I couldn't let this one go without a...

Hello. I need an explanation for a strange phenomenon ... I use a fan (PC type) powered by mains (220 V / 50 Hz in my country). At a distance of about 3', I get a sin EM field (sure it is not by mains cords) at a stable frequency of 200 Hz synchronized on main frequency. Even during power on...

If this has been covered or is so fundamental a question that its dumb... please excuse me...:redface:... otherwise, an answer is appreciated, thank you! Actually I just realized its probably a property if it is emergent at all. Another two properties I'd like to know about in terms of...

I've read that ferromagnetism is a quantum mechanical phenomenon and have some questions: 1) Is it an example of quantum coherence, like laser light, superconductivity, etc.? 2) Since it depends on electron alignment amongst the iron atoms of the magnet, and since electrons have both...

hi... we see this phenomenon in our everyday lilfe...:redface: in a sink, if we open its hole suddenly, the water gushes toward it in circular manner and not directly... why the water has to first circle the hole and then it passes through the hole...why it never takes the shortest...

Hello,I just discover a interesting phenomenon at lunch time when I drink a glass of water: When I hold a glass in my hands, If I look from above at the innerwalls of the glass, we can see a very bright and clear image of patterns on your fingertips through the glass. But when I use...

I've got to do a talk for part of my physics degree and I'm trying to think of subject ideas. It doesn't have to be physics exactly, but must be scientific in some way. I was wondering if anyone had any ideas for quirky subject matter. To give you an idea, my favourite talk from the year...

Would I be correct to say that time would not dilate at all if I were to be sedentary throughout my life? & is it also correct to say that even for us individuals time dilates relative to each other? For example, we all move around, do things & time passes by, but though the difference may be...

How do meteor showers happen?

Hello, I just watched at a strange phenomenon. One of my PCB's (Cmos+TTL) is connected to my PC through a Centronics port. No power supply is provided by this wire (only data in and stobe signals). With main power supply off and filtering caps empty, this board runs perfectly during hours and...

Whenever I look in the bathroom mirror after a shower. I immediately notice where the reflection of my eyes are, there is some sort of larger shadow around them. If I move closer, my eyes look like bright white rings (no, it doesn't resemble the normal reflection). Both phenomena seem to change...

Can a theory which describes 5% of a phenomenon be considered "valid" or even useful?

How does the Gibbs Phenomenon effect the choice of the kth harmonics for bandwidth selection? Basically, I have plotted a square wave using the Fourier series analysis for choosing the kth harmonics. As, I increase the kth harmonics the oscillations increase. What is the smallest harmonic i...

Hello. Today I came across a physical phenomenon .. I played badminton in France, at the swimming pool. So I lost my paddle in the pool. (A badminton racket looks like a tennis racket) In the water, no matter how I throw the racket down, balancing it on the head in the bottom of the pool...

At the end of this class http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/embed21/, Prof. Walter Lewin spins a plastic object on the table. The object starts spinning, it stops and immediately starts spinning in the opposite direction. The question...

I am trying to come up with an explanation as to why this happened. My dad put a plastic container in the microwave with food in it. He microwaved it, and it turned out fine. He then took that one out of the microwave and put in another plastic container in. Also with food in it. The weird...

Homework Statement Show that the integral from -1 to 1 of p(x)*log|z-x| dx equals log|z - sqrt(z^2 -1)| / 2, where p(x) = 1 / (pi*sqrt(1-x^2)) 2. Other information This topic comes from Chebyshev interpolation. p(x) is the Chebyshev density. The Attempt at a Solution The best idea I could...

I have seen this number "trick" throughout the years and have never been able to figure out the mechanism. I'm sure most of you are familiar with it, and probably have a simple solution. Here it is for those who are not aware: take any number greater than 9 add up all of the digits of...

The concepts in "On the Origin of Gravity and the Laws of Newton" by Prof. Erik Verlinde, found at http://arxiv.org/PS_cache/arxiv/pdf/1001/1001.0785v1.pdf, are intriguing. There are two points which I do not understand, and would be grateful for any enlightenment. First, why is the holographic...

I'd purchased a http://en.wikipedia.org/wiki/Mosquito_bat" recently. These things are very handy for swatting mosquitoes in the rainy season. A little while ago, I noticed something curious while swatting: after I hit the creature, it falls on the floor and begins to spin rapidly. Many a time I...

Please have a look: http://www.thesun.co.uk/sol/homepage/news/2764647/Spiral-UFO-puts-Norway-in-a-spin.html It's strange isn't it? Anyone have an explanation? Could it be man made?

Looking for people interested in this topic for discussions and probable scientific cooperation

Hi, I'd like to know your thoughts on this topic from the Physics point of view: Sheldrake, R. (2005). The Sense of Being Stared At Part 2: Its Implications for Theories of Vision Journal of Consciousness Studies, 12, No. 6, 2005, pp. 32–49...

"born believer" is it the right place to post this? I just thought it's interesting.. http://www.telegraph.co.uk/news/newstopics/religion/3512686/Children-are-born-believers-in-God-academic-claims.html"

Chimpanzees share 98.4% of our DNA, does that mean that Chimps can eventually evolve into a human form of biological life. Questions does this 1.6% difference mean that chimps lack the DNA sequences to eventually evolve or are the existence of the DNA sequences just not present and they don’t...

The "This Man" phenomenon http://thisman.org/history.htm Ever dream about this man? The 2nd recognition description is unsettling, but with the other reports (and without knowing more detail), it seems that the psychiatrists could have been unintentionally planting a suggestion to the...

“mirage” is refraction phenomenon or total internal reflection phenomenon? “mirage” is refraction phenomenon or total internal reflection phenomenon?

Hey, first post in this forum! Ive been reading a lot of books related to biology and the more I read the more confusing the subject of electricity in living organisms gets. For example, a lot of books introduce membrane potentials as something that can be measured using two microelectrodes...

Please look into this site http://knol.google.com/k/alex-belov/paradox-of-classical-mechanics-2/1xmqm1l0s4ys/9# The experiment 2 animations This is animation based on classical mechnics laws http://mysite.verizon.net/vze27vxm/sim.gif This is animation based on theory of...

On the weekend I visited Blue Pool in Dorset, England. This is an old abandoned clay mine that has filled with water to produce an attractive pool. Apparently the colour of the pool constantly changes colour... http://www.bluepooltearooms.co.uk/" I didn't observe the colour changes...

Since I'm around that old question about an observed phenomenon came to my mind: - a cup is filled with water and heated up using a microwave oven. When I see it starting to boil, the oven is stopped abruptly. And while there is no more energy injected into the water, it boils even more for a...

I observed this 'phenomenon' while I was swimming... Here is the situation: When I look at my watch (which is submerged), its glass surface acts like a plane mirror at certain angles (e.g. when I rotate my wrist/arm), causing the contents behind the glass become invisible. Somehow all...

By chance I spotted and watched an Independent film called Mojave Phone Booth. I had mentioned it as being an interesting movie, and I was checking to see where it was filmed when I discovered that the movie was apparently based on a genuine and very strange social phenomenon. It struck me as...

By using the term "common ethics" I am referring somewhat to the idea of "common sense". You see it everyday in traffic, among pedestrians, in classrooms and everywhere there is human activity. We could say you can find it in the animal and plant kingdoms as well, but that would be an outright...

The name "phantom limb" implies an external extension of the body. Has a similar phenomenon been reported for internal organs? Thanks for any and all.

This indicates that sense of body position is arrived at by input from sight, touch, and proprioception, and that, when the stimuli are inconsistent, sight and touch are "believed" by the brain over proprioception: http://www.sciencedaily.com/releases/2004/07/040702093052.htm...

Homework Statement Put a hot metal ball on parallel horizontal rails. The ball starts to move. Investigate the phenomenon. Homework Equations I have found two equations, one exponential and one linear relating the expansion of the rails and the ball to the temperature increase...