Waves Definition and 1000 Threads

I think this is correct. Please verify. a L = (2n-1)w/4 so w = 4L/13 w = 4(191.75)/13 = 59 cm b 59cm is .59m f = v/w = 343/.59 = appox 581.36 Hz c L =(2*8-1)*59/4 = 15*59/4 = 221.25cm.

I tried drawing the wave, counting 3 meters (speed is 1 meter/s) and bounced back from the stationary point (at 5) when necessary. Using this, I found the answer to be drawing 2. Wondering if that's correct.

I tried various manipulations of the variables to get the formula to work. For example, given that density is mass per cubic units, I tried representing this as mass/(area x length) so that I could relate this to mu as mass per unit length. Similarly, I reasoned that force per unit cross...

Hi. I've seen quite a couple of demonstrations of standing waves that were excited at one end only, such as transverse waves on a string attached to a vibration generator and clamped at the other, or the motion of cork dust in a Kundt's tube with a speaker at one end and the other either open or...

My answer is simply 4.6+ 3.2 = 7.8m , correct me if I am wrong. If it's 4.6 ##\cos(2\pi*5.4x)## and 3.2 ##\sin(2\pi*10x)##, then the max amplitude should be sqrt(4.6^2 + 3.2^2) = 5.6m, correct me if I am wrong.

How does pi in physics relate to circular motion and waves? never saw a real life example where understanding pi improves engineering...😏 edit: [Link Spam edit deleted by the Mentors, and spammer OP has been banned][/ b]

I derived the formula for the quadrupole radiation power emitted by a system of masses: $$P=\frac{1}{45}\dddot{Q}_{kl}\dddot{Q}_{kl} .\quad\quad (*)$$ Note here that: (1) I am using geometrized units, so ##c=G=1##; (2) ##Q_{kl}## is the quadrupole tensor $$Q_{kl} = \int{(3x_k x_l - δ_{kl}\cdot...

The (covariant) product of the EM Field Tensor with itself is basically the Lagrangian Density for the EM Field. It leads directly to Maxwell's Equations. If there are no charges or currents present, Maxwell's Equations lead directly to an equation of motion for an EM Plane Wave. Now all EM...

It is well understood that an infinite monochromatic, circularly-polarized electromagnetic plane wave has no angular momentum density. However, a finite monochromatic, circularly-polarized electromagnetic plane wave packet does have an angular momentum density, arising from effects at the border...

Reference textbook “The Physics of Waves” in MIT website: https://ocw.mit.edu/courses/8-03sc-...es-fall-2016/resources/mit8_03scf16_textbook/ Chapter 2 - Problem 2.3 [Page 52] (see screen capture below) Question: In Problem 2.3, I have proved the hint equation, and it leads to the complex...

Apparently, the direction of wave propagation is the direction of ##\vec{E}\times\vec{B}##. From what I have seen so far, given Maxwell's equations, the set of solutions giving plane waves has the characteristics that 1) electric field has only a component in the ##y## direction 2) magnetic...

My initial thought was to model the wave as $$y(x,t)=Ae^{-B(x-t)^2}$$ This question is part of an automated grading system and the above entry is considered incorrect. I think I need to incorporate the information that the speed of the wave is ##v## somehow.

TL;DR Summary: The reason to force us consider complex solution for harmonic motion. Reference textbook “The Physics of Waves” in MIT website: https://ocw.mit.edu/courses/8-03sc-physics-iii-vibrations-and-waves-fall-2016/resources/mit8_03scf16_textbook/ Chapter 1 - Section 1.3 (see attached...

TL;DR Summary: A fluid on a vertically vibrating plate will, upon reaching a certain frequency and acceleration, produce standing waves on its surface. These are called Faraday waves, first described by Michael Faraday in 1831. Faraday waves are still an active area of research today, more than...

Imagine there is an experiment setup on a train. A laser, with a specific wavelength of light, is aimed at a target. The target is at a distance from the laser of some multiple of the wavelength. Let's say 10cm for the target distance, and the light's wavelength is 1cm, so when a pulse of...

attempt: 4 waves in first wave 4.5 waves in second wave 0.5 is the difference and so they are in anti-phase at 18 secs 180º = phase difference for 18 secs so then after that i cant figure a way to solve it out...

I am more so stuck on where to start with this problem. I know dividing the photons per second by the area gets me the photon per area, but I am not sure how the distance is related to this part of the problem. If anyone can help, thank you.

Hi, I solved part (a) and will provide my solution below. However, I've been working on part (b) for quite a bit and reviewed the provided, relevant text a few times now but haven't been able to find what I'm missing: Solution (a): Using ##A = \frac{\pi \times d^{2}}{4}##, ##k =...

If you play a note of a certain frequency on a flute and simultaneously sing a note at a different frequency, then you create a third frequency that wouldn't be there if you play or sing in isolation - and the frequency of this subharmonic is the difference of the flute frequency and the voice...

My clarinet teacher once showed me a trick: you can play any note and then sing a fifth above that note and it will create the illusion of sounding an octave deeper. On a different sub, I asked about this technique: It turns out that this is called saxophone growling. And it's no coincidence...

We know the wave function: $$ \frac {\partial^2\psi}{\partial t^2}=\frac {\partial^2\psi}{\partial x^2}v^2,$$ where the function ##\psi(x,t)=A\ e^{i(kx-\omega t)}## satisfies the wave function and is used to describe plane waves, which can be written as: $$ \psi(x,t)=A\ [\cos(kx-\omega...

My professor was teaching me about the superposition of two waves and after this derivation, he marked ##2Acos(\frac{dk}{2}x -\frac{d\omega}{2}t)## as the oscillation part and ##sin (Kx-\omega t)## as the oscillation part, I don't understand why? Any answers regarding this would be considered...

NANOGrav waves are real observational data, and now this: https://arxiv.org/abs/2307.08601. I don't know much in this area of research, except for the basics on LIGO and the like. Any comment from the knowledgeable members here?

There are a few articles about negative radiation pressure - in theory allowing to pull e.g. solitons: https://scholar.google.pl/scholar?q=negative+radiation+pressure The articles suggests realization in graphene - could it work? Could there be different realizations, like negative radiation...

I was studying for a Physics Masters Entrance Exams (India) and my coaching institute basically suggested me these books: I actually have regretted buying books without prior research in the past, so I am making sure I do my fair share of research before buying any of these or something...

I am actually an undergraduate in Physics but I didn't understand this basic phenomenon. I saw this youtube video today and I was wondering how molecule in air would be able to regain it's initial position after it has transferred it's energy to the adjacent particle. Is it like a rebound, it...

How are we interacting with light to measure its frequency? And how'd we learn the distance between its crests and troughs? What sort of interactions are giving us such info?

Can the energy of a gravitational wave be related to Plancks constant?

May I know how is it possible for two waves to be in phase when they have different amplitude? I couldn't find any existing graphs that clearly shows how the two waves are in phase, would anyone be able to sketch it out so I can have a look. Thank you:smile:

One of the strange features of Quantum Mechanics is that for his formulation one needs the classical physics that actually should emerge as its macroscopic limit. All experiences with quantum objects have to be analyzed through classical "glasses". Naturally, then the question arises: where...

##\mathbf {Homework ~Statement:}## Consider the superposition of two one-dimensional harmonic waves $$s_1(x,t)=3.5 cm \cdot cos(27.5s^{-1} \cdot t - 5.65m^{-1} \cdot x)$$ $$s_2(x,t)=3.5 cm \cdot cos(27.5s^{-1} \cdot t - 5.5m^{-1} \cdot x)$$ ##\mathbf {a)}## Calculate the wavelength ##\lambda##...

Hi all, Looking to measure some magnetic waves being generated at an electric coil. Freq is between 0-20kHz and magnitude is pretty small <1T. Any have suggestions for the best tool to measure and log data of this magnetic waveform? Googling around, I found meters like this: [Possible spam...

I am a high school student and recently I have been working on a project about how temperature affects the frequency of a string emits. I have read blogs like https://www.physicsforums.com/threads/tension-and-frequency-with-change-in-temperature.833185/ and completed the part of thermal...

The operation of a transmission line is based on the axial propagation of electromagnetic waves between the two line conductors. However, the study of the transmission lines does not focus on E and B waves but on voltage and current waves. It is considered that there are resistance...

I was reading this paper (*Green's functions for gravitational waves in FRW spacetimes:* [https://arxiv.org/abs/gr-qc/9309025](https://arxiv.org/abs/gr-qc/9309025)) and I had a specific question about one statement in the paper that I would like to ask: At page 6, the author says that...

I am interested in any discussions about wave propagation. I authored: Huygens' Principle geometric derivation and elimination of the wake and backward wave https://www.nature.com/articles/s41598-021-99049-7

If we consider the coefficient b as the rings impedance, we can consider the effective impedance on the right to be b+Z2 where Z2 is the impedance of the second string. Then because there is no reflection it follows that Z1=b+Z2 or b=Z1-Z2. Is this a valid solution? My professor went through a...

For some time I was wondering, what would happen if the Sun just disappeared like someone hit the delete button in Universal Sandbox. Specifically, what kind of gravitational waves will be produced in the wake of such an event? Would the law of conservation of Mass-Energy be miraculously...

The solution pretends that the ship is a two point source emitter, one h above the water, and one h below the water. The one below the water is out of phase by half a wavelength. I don't understand why then d sin θ = λ - wouldn't it be d sin θ = (1/2)λ since it is out of phase? Thank you.

Here is a picture of the problem: I honestly am pretty lost, I'm not looking for an answer, more so an idea to get me started. But here is what I was thinking: In the equation above I was trying to use: For U I am unsure how to incorporate the weight of the blocks into the u, so I am unsure...

I've been reading many references that said "frequency" and "angular frequency" are two different things. I'm writing a report about damped oscillations experiments (that's a task from a subject in my college). Can someone tell me which one is the resonant frequency (natural frequency)? f or ω...

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I wonder if anyone could help me identify a short story I read back in the 1960s. It might have been in an old (1950s) copy of Astounding Science Fiction magazine. I think the story involved a sea journey but the main thing I recall is that that radio wave communications was interpreted as...

Is the doppler effect on electromagnetic waves receive by cell phone in fast car and so somebody talk with cell phone in fast car view this effect

Summary: Cofnusion regarding waves on a sonometer band A tuning fork is used to determine the wave frequency of a sonometer(according to my understanding), so whay about pulse waves? Does a pulse have a wave frequency? Couldn't a pulse travel over the sonometer band that can be determined by a...

My first attempt was to work with the the difference in arrival times, but that didnt account for the focus to be under the epicenter. So I tried again in combination with the angle between the stations but have not arrived at a clear solution.

The speed of a wave in simple harmonic motion on a string is $$v= \sqrt{\frac{F}{\mu}}$$ where v= the horizontal velocity of the wave on a string. Is the F the horizontal force or the resultant force (combination of Fy and Fx)?

In the ongoing quantum interpretations and foundations thread vanahees71 explained to me that the wave particle duality has been explained by the model where the position of a particle is calculated according to a probability distribution traveling in space. Am I understanding this...

1) If I generate a dispersive wave, will it have well-defined constant wave number and frequency? Ones that don't change in time? 2) does the velocity of any point on the wave stay constant in time? 3) How does force interact with waves? Does a free wave act in analogy with free particles...

When we talk about sound waves in a fluid (air, water e.t.c.) we mean that the pressure ##P(x,y,z,t)## satisfies the wave equation, the so called velocity field of the fluid ##v(x,y,z,t)## satisfies the wave equation or both?