Classical Physics

Wavelength refers to the distance between two crests or between two troughs. Imagine standing on the beach and looking at the waves coming towards you. The waves can cover a long distance along the beach, let us call it their width, but that is irrelevant. What you want to know is how often they follow each other (frequency), how high they get (amplitude), and of course what we have referred to as their wavelength. Here is a genuine question: To measure the wavelength, we are told to measure the distance between the points on a screen of (monochromatric) light that has come through two or more slits. This is a horizontal distance, comparable to the width of …

I find the idea that waves transport energy and not matter very mysterious. There is of course the case of electricity running through wires, but I find somehow this phenomenon easier to understand. The perfect example of the principle "energy and not matter" is given by the example of two transversal waves running along a string. They seem to pass through each other without disturbing each other, reaching the end of the string and come back running again. I never understood why such waves were not simply considered as two standing waves, the place where they meet being the place of their collision and their recoil. In other words, why assume that they go…

Short waves have advantage when we need to code a lot of data. But they can't regularly spread for a large distances. (unless we use an expensive satellites). Long waves on other hand can spread for thousands of kilometers, but cannot code a lot of data. Is there an absolute connection between frequency and wavelength? Can we modulate short waves somehow to increase their effective wavelength? For example, wavelength depends on phase velocity. Does it mean that modifying phase velocity we can change wavelength regardless of frequency?

Hi all, Just a quick one, what happens when you cut a magnet along its length so that one pole has less volume/mass than the other? Would the thinner pole just be weaker or would the whole thing re-align? I'm thinking that it would shift the poles so that the point is somewhere in the middle, sort of "sharing out" the weak point between the two poles Can anyone enlighten me? Thanks, Al

Is plasma heated to 2000-3000 C and composed of H+ and OH- ions equilibrium or non equilibrium plasma?

§ 1. Maxwell's Structure of Light The electromagnetic transverse wave equations of light are derived using Maxwell's equations, ∇ x E = - dB/dt........................∇ x B = 1/c (dE/dt).....................................73a,b Maxwell's curl equations (equ 73a,b) are expanded to form, dEz/dy - dEy/dz = - dBx/dt...........................................................................74 dEx/dz - dEz/dx = - dBy/dt...........................................................................75 dEy/dx - dEx/dy = - dBz/dt........................................................…

Hello people, as the title says, I want to know if light can be closed in a mirror's box. My idea is, build a sealed mirror's box (The mirrors must reflect the 100% of the light), in that any light particle can escape, later turn on a light inside for 5 seconds and then turn it off (Let's suppose that the light source is "invisible" to make that the light can't be abosrbed for anything). So if I do that... Will the light be closed forever, bouncing against the walls? Or it will gradually start losing momentum and/or luminescence?

Is there (or rather, what is) a maximum distance that light can travel? Surely there is. Can anything travel forever, infinite energy? If we think of light in a way similar to batteries. A rough similarity I am afraid. Then we could (possibly) explain the problem of the universe not having enough matter/energy, as we can only see part of it. The light from the rest of the universe not reaching us because it exceeds the maximum distance light can travel. Thus there is more universe out there that we cannot, and never will, see unless we travel to another galaxy.

If I shine my laser pointer at a container that is translucent but closer to opaque, a red glow appears inside the container, big enough to completely fill the container if it is small. I've tried doing Google searches for an explanation, but I guess I don't know the right search terms to use. Could someone please explain what is happening here, hopefully without mathematical equations? Thanks!

I need help of physics in order to calculate/predict the fracture propagation of rocks when the force is applied to it. I know there are a lot of variables, a lot of factors influencing (velocity, properties of specific stone, the properties of material that the force is applied with, angle of the strike...). For me it really hard, because I am a newbie, can someone show me the way/ where should I start looking for solving my puzzle (articles/books). Thank you very much.

There are lines of high voltage powers standing in the middle of a park which is under construction . I don't understand why local government permits it ?? Besides park, there are around hundreds of thousands of people living near by. Is living near high voltage power a threat to people's health ? I did some research. http://www.newhealthadvisor.com/Living-near-Power-Lines.html this one is horrible. https://hps.org/hpspublications/articles/powerlines.html this one is controversial. which one is right ? who can give me a latest scientific answer ? thanks ! https://emfhomeinspections.com/living-near-power-li…

Which relatively simple and inexpensive device is capable to create strong broadband EMF interference in a near field (1-3 m) zone? Approximately it has to jam any signal in the 1 MHz - 10 GHz range or so. Are transformers, Van den Graaf generators, metal detectors or induction Owens capable to do something like this? What about zummers or negative ion clouds?

I understand that both these constants are experimentally observed . Can I deduce from that that there is no particular reason why the numbers noted should be what they are? Is there a close relation between those two constants and the speed of a massless object in a vacuum?

§ 1. Maxwell's Structure of Light The electromagnetic transverse wave equations of light are derived using Maxwell's equations, ∇ x E = - dB/dt........................∇ x B = 1/c (dE/dt).....................................73a,b Maxwell's curl equations (equ 73a,b) are expanded to form, dEz/dy - dEy/dz = - dBx/dt...........................................................................74 dEx/dz - dEz/dx = - dBy/dt...........................................................................75 dEy/dx - dEx/dy = - dBz/dt........................................................…

The transmission and reflection equations of light are derived using light waves represented with (Hecht, p. 111), I = Io cos(k1x - wt) ĵ,...................................................................................116 R = Ro cos(k1x - wt) ĵ,...............................................................................117 T = To cos(-k2x + wt) ĵ,..............................................................................118 The incident (I), transmission (T) and reflection (R) light waves' (equ 116 - 118) interaction at the transmission and reflection surface (fig 18) is represented with, …

In Fresnel's paper, "Memorie su la Diffraction de la Lumiere" (1819), Fresnel describes diffraction using interfering light waves formed by the vibration of the elastic fluid (ether). "21. If we call λ the length of a light-wave, that is to say, the distance between two points in the ether where vibrations of the same kind are occurring at the same time" (Fresnel, § 21). "Admitting that light consists in vibrations of the ether similar to sound-waves, we can easily account for the inflection of rays of light at sensible distances from the diffraction body." (Fresnel, § 33). "To understand how a single luminous particle may perform a large series of oscil…

A Photon has kinetic energy. Yet, no rest mass. I may be wrong, but of a photon, I think (substance presented as a particle). The Universe needs dark energy/matter. A lot of it. The Universes is expanding really fast, even accelerating. I am assuming space is also expanding, really fast, even accelerating. Is a defining particle of space needed to ask if the rapid expansion of space might create a lot of kinetic energy? Is the presence of energy enough to assume a link between the expanding space and the energy? Do I need a particle to assume substance? Another question - A pie chart might show 68% Dark Energy, 27% Dark Matter, then show less than 5% as being o…

So I was watching a video on bottle busting. Basically, you take a non-carbonated liquid, smack your hand onto the top of the glass bottle, and then the bottom of the bottle shatters. This happens because the bottle moves down faster than the water, creating a vacuum at the bottom of the bottle. The water then rushes to fill that gap 10x faster then what you hit the bottle with. Effectively, it seemingly magnifies the energy to break the bottle. But that's impossible, and I know it. So where did the extra energy come from? Assuming you transfer 7 kilograms of force to the top of the bottle, why does the bottle break from a force of 70 kilogram…

§ 21. Maxwell's Equations With the method developed in the derivation of the equations of the atomic orbitals allows for the derivation of Maxwell's equations and Maxwell's structure of light. Maxwell's electric curl equation is derived using Faraday's wire loop induction effect represented with the magnetic flux (fig 15), emf = - ʃʃ (dB/dt)· dA...........................................62 A second wire loop emf equation is used that represents the internal electric field E that forms the wire loop emf, emf = ʃ E · dl........................................…

Hi I would like to present my new simulation rotated rigid ball. Brief introduction to the Dzanibek Effect When I learned to simulate the effect and study the secrets of vector relationships with no problem to finde speed vectors for points. Next step is finde acceleration. It is a=(v1-v0)/dt. To spread this vector I set the angle n of inclination of both vectors and line acceleration it is al=cosn*a. Centrifugal acceleration it is ad=a-al. Now it is easy to determine the force acting on the point. It is F=am. Now I set the angle m between force vector and main axis. Central force is Fc=cosm*F. Remaining component is forces creating a moment of force. Y…

Hello guys! I am confused about the concept of energy. I have read that energy is the ability to do work. But this definition of energy seems incomplete to me. I wonder what exactly is energy. Is it a physical thing? can we see it? touch it? does it exist in matter as an invisible thing? Also the law of conservation of energy says that energy can never be created nor destroyed. So what is this thing called energy that can't be created or destroyed?. Can anyone please clarify this concept to me? It would be of great help. Thanks!

Lenz's law states that the current induced in a coil due to a moving magnet is in a direction such that it opposes the motion of the magnet. Now the question is would the moving magnet experience resistance instantly or does it have to wait for the current to be induced in the coil and the effect of this current to resist its motion. Since nothing can travel faster than light, it would take some amount of time (however small it may be) for the current to be induced in the coil and the effect of this current to travel back to the coil. So is energy conserved for such small intervals of time?

A chameleon can accelerate its tongue in order to catch an insect at an impressive rate of 500m/s^2. How quickly must a fly located at 5cm from the chameleon react if it is to escape? Given: Vi = 0 Vf = ? xi = 0 xf = 5 cm a = 500m/s^2 Using the equation: Vf2=Vi2+2a(xf-xi) Vf=70.71m/s Could someone please double check this answer for me. Thanks!

Hey everyone, I have a question that what is the pressure of perfect circle? I think we can think this in 2 ways; Physical properties and mathematical. If we look this in pysician view we should think about atoms, and the electron cloud. If we assume the circle is super solid that wont break we can think its on a electron cloud and its pressure should equal mass/diameter of electron. But we know that electron is fundamental and has no volume, so will it be infinite or mass/Planck's length? And if we look this in mathematician way thats virtual and doesn't contain atoms or any smaller particles we can guess Its interact point is the smallest measurement of all time. I…