Questions tagged [waves]

Waves are disturbances that propagate through space and time. Classically, they travelled through a medium, disturbing the particles but not changing their mean position. Electromagnetic waves/particle-waves need no medium; they are disturbances in their respective fields.

Filter by
Sorted by
Tagged with
0
votes
0answers
16 views

If electrons take time for wave's energy to get absorbed then how can wave nature of light explain Reflection(an instantaneous process)?

An electron absorbs the wave's energy and vibrates to produce EM waves that are in direction of reflected light. But an electron takes time to absorb wave's energy and this reason was also given at ...
4
votes
1answer
39 views

Why are there no even harmonics in a closed pipe?

I have seen a diagram on sites such as hyperphysics.com that show that there is a missing bit every time so that it makes every harmonic odd. I was hoping I could get a more intuitive explanation. We ...
0
votes
0answers
18 views

1D wave - impedance & amplitude relation

Consider a string with variant characteristic impedance $Z(x)$. Also $Z$ is a continuous function. We are exciting the edge of the string so that $y(t) = Ae^{iωt}$ at that point. Is it true that if $...
0
votes
0answers
14 views

Reference for Non-Linear Water Waves

In class, my professor just mentioned that some finite-amplitude water waves were satisfied by the KdV equation. Is there some reference which shows how to derive this from $1st$ principles, and also ...
-2
votes
0answers
33 views

Do the mathematical properties of music have undiscovered technological value? [closed]

Im just asking for ideas and opinions The script below is just an idea of mine, the idea is an invention of 7phase modulation for radio/fiberoptic/electric channel for internet data transmission, and ...
1
vote
0answers
35 views

The relative velocity of sound waves in Doppler effect

Let speed of sound in the medium be $v$ when the source is at rest w.r.t the medium. In the case of the observer moving towards the stationary source with a velocity of $u_1$, the speed of sound ...
1
vote
0answers
9 views

Relation between phase change and mass of bodies during wave inversion

Is there a relation which shows how the phase change depends on the mass of the bodies in mechanical wave inversion? This question also applies to EM-waves and any sort of relation to explain their ...
1
vote
1answer
34 views

Wave rate of energy confusion [closed]

Consider we are exciting the edge $x=0$ of a string, so that $ y(0,t) = A\cos(ωt) $. We know that the rate of energy is $$ \frac{1}{2}ρω^2Ac = \frac{1}{2}ω^2A\sqrt{Tρ}$$, where $ρ$ is the string ...
0
votes
0answers
31 views

Difference between alfven waves and magnetic fluctuations in solar corona

I have read in this paper https://arxiv.org/pdf/1911.07973.pdf about particles being accelerated in the solar corona either by Alfven waves (to my understanding when the turbulence is weak) or by ...
8
votes
2answers
88 views

Why does a spinning rod create transverse waves?

I attached a ballpoint pen refill to a DC motor and made it spin very fast. Instead of just turning along its axis, the refill started to wobble around to make a transverse wave. You can see that ...
0
votes
1answer
44 views

Interpretation and computation of properties and polarization of an electromagnetic wave (transverse wave)

I would like to calculate the polarization properties of a plane wave (transverse electromagnetic wave), based on values of an export file from an electromagnetic simulation. The values are recorded ...
3
votes
1answer
24 views

Why is the intensity function of $N$-slits interference symmetric?

I'm taking a course of quantum physics and we were asked to plot the intensity function of interference between the waves which exit 20 slits, when the distance between the slits is given by $$ d+A\...
0
votes
3answers
43 views

Can a wave undergo SHM?

I am recently studying about Simple Harmonic motion and during that I thought, Do a wave undergo simple harmonic motions ? Do they ?
1
vote
2answers
29 views

Why use solids for soundproofing when sound waves travel through them faster?

I'm doing a soundproofing experiment where I test out different materials with different specific heat capacities to see how SHC affects how much sound level is emitted. But I also know that sound ...
2
votes
4answers
84 views

Has a reflected wave an arbitrary phase shift?

Let an EM wave propagate in the $\hat{z}$ direction - $$\vec{E_I}(z,t)=E_0e^{i(kz-\omega t)}\hat{x}$$ it hits a conducting surface at $z=0$ so there is a reflected wave - $$\vec{E_R}(z,t)=E_{0R}e^{i(-...
1
vote
1answer
41 views

Explaining light distribution trough a gap using waves and Huygens principle

According Huygens principle when a light wave goes trough a gap that is so narrow that only one wavelet can pass, it would spread out in all directions like in this image: (image from https://en....
2
votes
0answers
14 views

Mechanical wave transmission through 3 strings of different medium qualities

How would the motion of waves behave if there are 3 strings joined to each other (as displayed in the fig.) and a wave was started in the string-3? Which would undergo inversion of strings and for ...
2
votes
0answers
30 views

Reasons for mechanical wave inversion? [duplicate]

General idea (with strings): When a wave in a string in transmitted through 2 different media, a part of it is inverted and a part transmitted. 'Rules:' If a wave enters a region where the wave ...
1
vote
0answers
30 views

Direction of momentum and group velocity of electron in a solid

So I am looking at the dispersion relation of electrons in a solid i.e. a $E(k_y)$ plot and I am being bugged by a very basic question about wave propagation. If $v_g = \partial E/\partial(k_y) > 0$...
1
vote
1answer
40 views

Why do we demand that $\lambda \ll \text{size of slit}$

I'd appreciate it if anyone could explain to me why do we demand that the wavelength will be much smaller than the distances between the slits in order to see wave diffraction when performing Young's ...
0
votes
4answers
81 views

Peculiar Question: Can Sound travel through particles of Light?

It is an Thought Experiment. Imagine a box that is lined on the inside with 100% perfect mirrors. Shine some light into that box and seal the box. The light will bounce back and forth between the ...
0
votes
0answers
15 views

If both violet light and red light was incident on the center of a semi circular block, and refracted, would they have the same refraction angle?

As the violet and red light have the same speed in air, with the incident angle being less than the critical, with the violet light and the red light coinciding on each other, (like on top of each ...
0
votes
0answers
20 views

Resource needed for finding the derivation of this equation [closed]

I am a high school student working on an assignment. I was hoping to find a resource through which I could better understand/learn how to derive the initial equation in this article. I have tried to ...
0
votes
0answers
25 views

Power spectrum on wavelength

For a peak in hydrogen spectrum, we fit a peak function of Lorentzian. I seeked for an explanation and I found the power spectrum $|f(\omega)|^2$ is in fact the Lorentzian. $f(\omega)$ is the Fourier ...
0
votes
0answers
12 views

What are the phase speeds of A0 and S0 Lamb waves at very low frequencies?

Lamb waves are elastic wave modes in plates. In general, they are mathematically complex to deal with, and numerical solutions are typically used to find dispersion curves for each mode, as shown in ...
1
vote
0answers
17 views

Is there a formula that links between emited sound level (dB) and specific heat capacity?

I'm doing an experiment on soundproofing and seeing how different materials with different specific heat capacities affect the level of sound emitted from a music speaker. Each material is formed into ...
4
votes
3answers
255 views

How to calculate the phase and group velocity of a superposition of sine waves with different speed and wavelength?

This might seem like a trivial question but it is not for me. So, I was reading on group and phase velocities from A.P. French where he calculates the phase and group velocities for a superposition of ...
0
votes
2answers
36 views

Speed of light and wavelength

Does the speed of Electromagnetic wave depend on its wave length? For vacuum I'm aware that it's a constant $c=\frac{1}{\sqrt{\mu_o\epsilon_o}}$. Similarly can we say speed of light in any medium is a ...
-1
votes
1answer
28 views

Average value of potential energy and kinetic energy in simple harmonic motion [closed]

In the Derivation of the formula of average potential energy and kinetic energy in simple harmonic motion. Please explain the step in the image.
-2
votes
0answers
25 views

Potential energy of a three coupled pendulum [closed]

For a three coupled pendulum, coupled by springs of force constant $k$, (generalized coordinates used are angles $\theta_1$, $\theta_2$, $\theta_3$). In the potential energy equation, there is a term ...
2
votes
3answers
89 views

Relation between frequencies of different harmonies

I know the relation between frequencies of different harmonies is $$ f_n = n\times f_1 $$ but I'm heving trouble to develope the equation which proves this equality. can anyone please give me a lead ...
0
votes
0answers
31 views

Waves and Alternating Current

What will happen if a metallic spring fixed at one end which is connected to a steel wire of certain length and the other end of the steel wire is connected to an AC source. Shall we see the spring ...
1
vote
1answer
45 views

Harmonic waves: direction left or right?

Consider $E(x,t)=A\sin(kx-\omega t)$ where $k=2\pi / \lambda$, with $\lambda$ the wave length and $A$ its amplitude. We have $$E(x,t)=A\sin(k(x-vt))$$ so this wave is going to the right. Know, if I ...
0
votes
0answers
15 views

Does the angle between adjacent maxima remain the same?

Is the angle between adjacent maxima, in this case adjacent rainbows, the same. That is, is the angle made by the First-order rainbow and Central white the same as the angle made by the First-order ...
2
votes
1answer
30 views

Do reflection and diffraction occur at the same time?

When waves pass through a gap as the above, diffraction occurs. As the upper and lower part of the plane wave (indicated by yellow colour) are striking the barriers, does reflection occur at the ...
0
votes
0answers
5 views

what are the vector spherical wave functions and the vector cylindrical wave functions?

When the elastic wave strikes the inclusion, the outer wave scattered. In the scope of elastic wave propagation, there is a T-matrix method for scattering based on the vector spherical wave functions ...
1
vote
3answers
126 views

Deriving the wave equation for electromagnetic waves

I'm currently referring to the wave equation derivation given in "Introduction to Electrodynamics" by David J. Griffiths. It follows something like this: The electromagnetic wave equations are given ...
0
votes
1answer
33 views

Spacing between primary maxima of $N$-slit diffraction pattern and single-slit envelope

As far as I know, in the double-slit diffraction pattern, the spacing between primary maxima is determined by the equation of double-slit interference pattern, and the intensities of primary maxima ...
2
votes
2answers
72 views

Does a particle interact with the slit in diffraction from a single slit?

The wave explanation of the diffraction pattern from a single slit takes in account the interference of the wavelets of all points between the walls of the slit. In effect it turns so that the wave ...
0
votes
1answer
63 views

What is the importance of the speed of sound in our day-to-day life? [closed]

The speed of sound is mentioned everywhere but, despite studying so much, I still don't understand the importance of the figure and how it has had its impacts on the real world.
1
vote
1answer
41 views

Direction of the force of a mechanical wave

Currently, I am learning about mechanical waves in school, including sound and what-not. My teacher provided us with this formula for the energy per length of any given wave on a string: $ E/L = 2(π^2)...
-1
votes
0answers
24 views

multiple mediums to model them to TRANSMISSION LINE MODEL

I have three regions of mediums and I want to model them to TRANSMISSION LINE and that in order to calculate the Electrical field in third region, how could I do that conversion from model of MEDUIMS ...
0
votes
4answers
155 views

Are Electromagnetic field real physical entity?

Up till now, I always thought that the electric and magnetic fields are mathematical constructs which aid our understanding. What was a one-step process of particle $A$ exerting force on a particle $B$...
2
votes
2answers
44 views

Periodicity of the solution of the wave equation

In a few references, I have found that if I have a wave equation $$ \nabla^2 E=\left[\frac{n(x,t)}{c}\right]^2\frac{\partial^2E}{\partial t^2} $$ where the refractive index is periodic in space and ...
0
votes
0answers
21 views

Huygens' principle, term in equation

I was read this paper about Huygens' principle(https://engineering.purdue.edu/wcchew/ece604f19/Lecture%20Notes/Lect31.pdf) Main idea of Huygens' principle is how wave function $\psi(\textbf{r})$ $r\...
2
votes
1answer
50 views

Vector Helmholtz Equation

In my recent exercise book I've derived the following equation that needs solving: $\nabla^2\vec{u} + k^2\vec{u} = 0.$ The deformation vectors points only in the $\hat{e}_r$ direction. I didn't want ...
0
votes
0answers
22 views

Is there any operator for the scattering problem of an elastic wave in Hilbert space?

From an algebraic perspective, there is a common shape for wave propagation that includes operators in Hilbert space. I want to know is there any operator in Hilbert space that describes the elastic ...
0
votes
1answer
28 views

Effect of acoustic wave striking an object

I am trying to understand the effect an acoustic wave has on an object. I have two speakers, one on top of another, and both emitting a Sine wave of 64Hz generated in MATLAB sampled at 44100. I place ...
0
votes
0answers
126 views

Infinite universe and the impossibility of monochromatic light and infinite plane waves

I recently asked a question relating to this excerpt from the textbook Optics, fifth edition, by Hecht: Mathematically, the plane wave extends out to infinity in all its directions, and, of course, ...
0
votes
1answer
48 views

$\psi(\vec{\mathbf{r}}, t) = C_1 f(\vec{\mathbf{r}} \cdot \vec{\mathbf{k}}/k - vt) + C_2 g(\vec{\mathbf{r}} \cdot \vec{\mathbf{k}}/k + vt)$

I am currently studying Optics, fifth edition, by Hecht. I was presented with the three-dimensional differential wave equation $$\dfrac{\partial^2 \psi}{\partial x^2} + \dfrac{\partial^2 \psi}{\...

1
2 3 4 5
75