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.

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The AM (amplitude modulation) wave sidebands

I'm studying for A-level now..... I have read some other posts explaining how the sidebands generated after the carrier wave is modulated. So, if there is sideband frequency, the frequency isn't ...
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20 views

A level 9702/11/o/n/14 question 26 (about interference of sound wave) [on hold]

The speakers are identical and they are connected it's series with power, so I thought there would be complete destructive interference. Therefore, at some point the amplitude would be zero and also ...
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22 views

Wave equations for reflected waves in standing wave calculations, when the end is fixed and when it is free?

Consider a sinusoidal wave moving in the +x direction $$y_{1}(x,t)=A\sin\left [ \frac{2\pi }{T} \left ( t-\frac{x}{v} \right )\right ]$$ (A) At a fixed end, the amplitude of the resultant wave ...
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1answer
23 views

How can I decrease the volume of a sound wave?

I have a sound wave in a computer, represented as a series of values (samples). Each sample is in the range roughly between -30000 and 30000. Say I want to decrease the loudness of the entire wave by ...
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2answers
18 views

How can I add two sound waves without reaching distortion - always keep them under a certain value?

I'm working on a program that adds sound waves on top of each other. I read that the best way to do that (correct me if I'm wrong) is to simply add them together. However, this way I easily reach ...
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1answer
37 views

How can I add a sound wave on top of an existing one, without harming the original's loudness?

I'm working on a program that has to do with adding sound waves on top of sound waves. Currently what I'm doing is simply an average of the two waves. So if I have wave ...
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1answer
31 views

How do particles in a wave make the next particles move?

i only know few things about waves,but this question just popped up in my mind. I already know that the particles transfer energy to each other,but i do not know HOW they do it! The truth is that i ...
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1answer
24 views

Solitons and its infinite extension

A soliton, for example the KdV equation solution, has the profile proportional to a hyperbolic secant squared ${\text{sech}}^{2}(x-ct)$. And since it is hyperbolic it has an exponential dependence, so ...
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19 views

Time for water wave to reflect

In class we discussed an experiment for measuring the speed of waves in water. The basic procedure went something like this: Make a wave at the near end of the tank and wait for it to travel to the ...
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19 views

How can i convert an audio into a waveframe? [on hold]

I'm interested in finding out how to convert a conversation, from it's audio form in a graphic script, audiowaves Thank you and have a blossom day!
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2answers
27 views

relationship of number of standing waves with Temperature?

If we have let us say fixed air column of length 'L', in a open-closed column problem, lamba is equal to 4*L/(2n-1). n = number of nodes / anti nodes in air column How does 'n' changes with ...
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1answer
68 views

The wave equation, methods of solving and superposition of waves?

I have some questions concerning the wave equation: $${\partial^2 y \over \partial x^2} = {1\over c^2}{\partial^2 y \over \partial t^2}$$ Firstly, does the method of separation of variables give ...
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7 views

Solution for elastic wave on plane of ideal contact between two half spaces of elastic, homogeneous, isotropic, linear solids

Please give the solution for elastic wave of arbitrary polarization incident at arbitrary angle on plane of ideal contact (meaning no slip, homothermal, nondissipative, and no transfer of material ...
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1answer
32 views

Non resonant modes in cavity

I have a simple question. Suppose we have a laser with a cavity such that the frequency of the light that the laser emits does not match with any longitudinal modes allowed by the cavity. In ...
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2answers
74 views

Are standing waves in water exact sine waves?

In many physics demonstrations waves in water are used to illustrate principles of standing waves and wave propagation. After such demonstrations, classes tend to move on to basic problems ...
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6 views

Zero stress boundary conditions for the acoustic wave function

When is it appropriate to use zero normal stress boundary conditions when solving the acoustic wave equation. That is when the pressure is equal to zero.
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1answer
31 views

Can surface waves exist near a fixed surface

(I'll phrase this question in terms of waves in an elastic medium, but this is a more general question.) Surface waves are waves near the surface of a medium whose amplitude decreases as you go away ...
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1answer
48 views

Is this a frequency domain plot for audio? [closed]

I have a program "spectrum" that draws an chart for an audio file (a short .wav with an human voice recorded on it). I believe it is a frequency domain chart. The ...
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2answers
87 views

Water Waves in the Wake of a Boat

As a boy I noticed that the waves from the wake of my model boat would fan out. If I looked at the end furthest from the boat the front had turned so that it was almost running in the same direction ...
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1answer
39 views

Double-slit experiment [closed]

Given the following wavelength: $\lambda = 1.75 \cdot 10^{-12}\ m$ This leads to the velocity of the electron (matter wave). First approach: $p = \dfrac{h}{\lambda}=m(v)v=m_e\gamma v$ [...] $v ...
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19 views

Group velocity and calculating wavelength [closed]

A stone tossed into a body of water creates a disturbance at the point of impact that lasts for Dt = 4.0s. Measurements indicates that the wave speed is v = 25 cm/s. (a) Over what distance on ...
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3answers
59 views

Why use different arguments to plot a sine wave?

In my Electronics class was given some examples of sine wave graphs that represent voltage in respect to time, $v(t) = Asin(wt)$ and other graphs whose $x$ axis is $wt$ instead of $t$, like in the ...
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0answers
18 views

wavelike properties of massive objects [duplicate]

I have learned in my HS physics 2 class that everything with mass has a wavelength given by the deBroglie wavelength. My question is : Does this mean that any object can show diffraction, such as in ...
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2answers
46 views

Wave equation - dissipation

The book states that the wave equation assumes no dispersion and no dissipation, with dissipation defined as a loss of energy and thus a diminution of amplitude. How can a spherical wave be described ...
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4answers
116 views

Does the information transfer in the internet also work with waves like radio and TV do?

I am accessing the Internet, downloading PDFs, and much more, but how? The servers are far away, but how do I download data if it is far from my computer? I can watch football matches live on ...
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1answer
43 views

Young's double slit experiment and intensity

I want to ask a question about double slit interference and the pattern that it produces on a screen (for example in Young's Experiment with a laser beam). I understand the reason that you see a ...
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1answer
21 views

Spherical waves superposition [closed]

If two spherical waves are produced by two sources $S_1$ and $S_2$ as described in the picture From the superposition principle, we know that : $$\Psi(M,t) = \Psi_1(M,t) + \Psi_2(M,t) = ...
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1answer
54 views

In what ways does matter behave like a wave? [duplicate]

thanks in advance for the help. Mainly, what characteristic of matter is wavelike? Does is physically move up and down like a wave, does it phase in and out of existence with a wavelike gradient, or ...
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3answers
18 views

Energy of a standing wave

I've been taught that energy of a standing waves remains between the nodes of the wave or in other words energy remains within the wave. I wanted to know how that's possible. Also if energy of a ...
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1answer
24 views

Wave hitting a boundary with a mass on it?

If we have a transverse wave that is infinite in the $-x$ direction and terminate by a mass $m$, that is allowed to move in the $y$ direction at $x=0$ as shown in the diagram below: I think we can ...
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24 views

Refractive index and electric susceptibility

Suppose we have a complex refractive index $n_{ref}=n+ik$ whose value is given at a precise frequency $\omega_l$ from experimental data. We know that the imaginary part is responsible for the ...
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1answer
30 views

Confusion in understanding wave number

The wave number is the number of complete wave cycles in a meter. So, $$K = \frac{1m}{\lambda}$$ and also, $$K = \frac{2\pi}{\lambda}$$ so according to both of the above equation how is $$2\pi ...
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4answers
66 views

Does increasing the tension on a string also increase the density?

Consider a string under tension, for example, a string on a guitar. When a guitar string is plucked, it vibrates at a certain frequency. When the tension on the string is increased by twisting the ...
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5answers
53 views

Does “apparent frequency” mean the Doppler effect is not an actual physical effect?

When discussing the Doppler effect, we use the word "apparent frequency". Does that mean that the frequency of sound is still that of the source and that it is some physiological phenomenon in the ...
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13 views

Formation of standing waves in a flume

Having observed standing waves in a flume when the Froude number > 1, I'm unsure how they form at this flow speed. My understanding of standing waves is that it requires equal waves traveling in ...
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0answers
32 views

Wave equation given a metric [closed]

Can you explain me how I can obtain a wave equation given a metric? For example, if I have this metric $$g_{\mu\nu}=diag(-e^{2a},e^{2b},e^{2b},e^{2b})$$ where $a=a(t)$ and $b=b(t)$, how can I ...
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2answers
56 views

Derive Equation for Position of Antinode

I'm not sure what to do for this. The equation for standing waves on a string is given by: $$ y=2A\sin{(kx)}\cos{(\omega t)} $$ Use this equation to derive an equation for the position of the ...
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2answers
64 views

Can gravitational waves resonate?

Can gravitational waves resonate? - Perhaps by creating standing wave interference in a cavity? Could that feasibly happen either in nature or by engineering?
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2answers
32 views

non diffracting waves

I came upon a proposed solution for a surface wave which was claimed to be a non diffracting wave. The wave at $z=0$ and $x=0$ (which is the propagating direction) is $E_z(0,y) = ...
2
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1answer
36 views

Why is the number of phonon modes in a solid restricted to a finite value?

Kittel's Thermal Physics (Amazon link) makes the statement: There is no limit to the number of possible electromagnetic modes in a cavity, but the number of elastic modes in a finite solid is ...
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1answer
38 views

Paradox of wave energy

Imagine that a wave with energy $E$ is given. as we know $E$ is relevant to the $A^2$($A$ is amplitude) now consider another wave (as same as the first one) and these two wave having a constructive ...
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1answer
34 views

Phase velocity greater then the speed of light?

It is my understanding the the phase velocity of a wave can be greater then the speed of light. So imagine we had a wave packet consisting of a single sinusoidal wave; $$y=sin(\omega t-kx)$$ Then ...
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2answers
31 views

Physical meaning of non differentiatiability of $y(t)$ at a point of an elastic medium

Consider two waves $y_1,y_2$ travelling in opposite directions with equations $$y_1(x,t) = A \sin(\omega t - kx) \\ y_2(x,t) = A \sin(\omega t + kx) $$ That create the following standing wave ...
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0answers
21 views

Generation of electromagnetic waves [duplicate]

I came across this while searching about generation of electromagnetic waves-Does this mean that if I vary the electric current following through a conducting wire, it will radiate electromagnetic ...
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1answer
31 views

If the phase velocity is different from the group velocity, why does the high-frequency wave remains fixed with the low-frequency envelope?

Phase velocity is the velocity of the high-frequency wave inside the envelope. While group velocity is the velocity of the low-frequency wave that makes the envelope. If these velocities are ...
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3answers
38 views

Where is the energy stored in destructively-interfering waves?

Let's say we have two waves moving along a string. One of them is represented by the function: $$f_1(t)=\sin(\omega t)$$ The other one is represented by a function: $$f_2(t)=-\sin(\omega (\tau-t))$$ ...
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47 views

General solution of the four-vector with each component satisfying the wave-equation

Maybe this is more appropriate for Math stackexchange, but this question regards the solution we use in order to find representation for massive / massless spin-1 particle. When $$(\Box + m^2)A_\mu = ...
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1answer
154 views

Solution of the wave equation [closed]

I am dealing with the solution of the wave equation in two different cases represented in figure by Case A and Case B. The two figures were obtained by shining a slab with an incident wave coming from ...
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28 views

What does invariant exactly mean and how does it get the invariant?

I have read many journal about simulation of regularized long wave. In numerical test section,many researcher use invariant of mass,momentum and energy to check accuracy of their method but i found ...
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46 views

What is the most general form for a plane wave?

In the context of electromagnetism, what is the most general form of a plane wave. My suggestion is: $$E=\sum_i{\vec E_ie^{i(\omega t+\vec k \cdot \vec r+\phi_i)}}$$ where $\vec E_i$ are constant ...