Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
0answers
15 views

Can a system be engineered to cause a standing wave resonance with gravity waves

Can a system be engineered to cause a standing wave resonance with gravity waves? It appears that gravity waves can be reflected. Do Mirrors for Gravitational Waves Exist? Stephen J. Minter, Kirk ...
1
vote
1answer
21 views

3 waves, calculate time of collective period?

I have 3 sinusoidal waves. Frequencies 1.3, 0.8 and 1.5 Hz. They all start at zero amplitude, at the same time. How do I calculate the time it takes for my waves to meet at zero amplitude again, and ...
0
votes
0answers
12 views

Graphing dispersive wave packet in Desmos [on hold]

I want to find a way to graph a dispersive wave packet using a graphing calculator app such as Desmos. The above is a graph of a non-dispersive wave, which is pretty easy to represent on a Cartesian ...
0
votes
1answer
30 views

Solution as the real part of a complex exponential from simple harmonic motion

From the book entitled Classical Mechanics written by John R Taylor, chapter no 5, Simple Harmonic Motion. I'm just citing the lines. $$x(t)=\text{Re }Ce^{i\omega t}=\text{Re }A e^{i(\omega t-\...
0
votes
1answer
28 views

Power and intensity of a sound wave

So in the case of a point source of a sound wave in a sphere, I'm wondering why the Intensity decreases with $r^2$ because if i setup the formula the Power always increases with $r^2$. So these two ...
7
votes
7answers
1k views

Apart from the sine wave, are there any other waveshapes that could be thought of as commonly appearing “in nature”? [on hold]

I'm familiar with the sine wave being something that can be used to model many types of oscillation in nature (and the way that multiple sine waves can be seen as sum to produce complex repeating ...
-2
votes
0answers
36 views

Simple harmonic motion spring

A block of mass $m = 500 \text{ g}$ is attached to a horizontal spring with $k = 50 \text{ N/m}.$ At time $t = 0.1 \text{ s}$, the displacement $x = -0.2 \text{ m}$ and the velocity $ v = 0.5 \text{ m/...
0
votes
0answers
45 views

Sound of water filling up a bottle

So there are many questions addressing but I am yet to find a correct response. Most answers indicate that the bottle should be modeled as a Helmholtz resonator or as a closed organ pipe with ...
0
votes
0answers
15 views

Determine frequencies present in complex wave from oscilloscope graph

How can we determine, from an oscilloscope trace of a complex wave like that shown below, the frequencies present? For example, in the case of the wave shown below, we are told that there are exactly ...
0
votes
3answers
22 views

Why doesn't the wave's frequency change as it gets refracted? [duplicate]

I know that frequency means a complete wave produced per second. But when the wave gets refracted, it's wavelength decreases. If the wave's wavelength has decreased doesn't it means that the wave has ...
0
votes
0answers
37 views

What does a negative end correction mean?

I was asked this question in one of my tests: "In an experiment to measure speed of sound by a resonating column a tuning fork of frequency 500 Hz is used. The length of air in the column is varied ...
0
votes
1answer
53 views

Solution differential equation E&M wave

i am wondering why we only consider a particular solution of the equation of em wave. I mean we have the 4 maxwell equations and we want to resolve them. Then we suppose the electric field is ...
0
votes
2answers
53 views

What is the amplitude and phase of this following equation?

Suppose I have two waves $$\begin{align} \psi(1) &= A\sin(kx-\omega t) \\ \psi(2) &= A\sin\{(k+\Delta k)x-(\omega+\Delta\omega)t\} \end{align}$$ and due to superposition $$\begin{align} \...
1
vote
1answer
29 views

Does a wave blue-shifted by the doppler effect increase in energy? [duplicate]

A wave is blue-shifted by the doppler effect. This increases it's frequency, so this should also increase it's energy as per the equation E = hv ? Therefore does the wave increase in energy from the ...
0
votes
0answers
8 views

Paraxial approximation - time varying

I want to reproduce the results of a paper I am reading. In the paper, authors use paraxial approximation. My question is: in the potential V, I can put a time dependence of space? Or the paraxial ...
2
votes
2answers
69 views

What does phase velocity physically represent, and why can it be superluminal? [duplicate]

Phase velocity is defined as $v_p=\frac{\omega}{k}$ and is described in various textbooks as being the speed at which the phase of a wave propagates. If you have a wave train that is modulated by an ...
4
votes
1answer
106 views

I was wondering if the mass of an object can be measured by the effect it has on a body of water if it was dropped from a certain height? [duplicate]

The question: Height of Water 'Splashing' asks about the height of the splash when an object is dropped into water, but there are other parameters that can depend on the mass and velocity of ...
0
votes
0answers
23 views

Relationship between Material type and Acoustic Reflection Degree

I have a 1.8mm and a 1.5mm thick surface of polypropylene and I'm beaming a pressure wave at it, what percentage of the wave's intensity/pressure (in decibels) gets through and what percentage is ...
0
votes
0answers
15 views

Phase difference between displacement wave and pressure wave in longitudinal waves

As the Mathematical treatment yields, the pressure wave leads the displacement wave by $\frac{\pi}{2}$. But I want to ask why is it so? According to me, supposing if the displacement wave is a sine ...
2
votes
1answer
60 views

Do clouds reflect radio waves?

Do clouds reflect radio waves? Specifically, those waves used in radars. And, what kind of matter refracts or reflects radio waves?
0
votes
0answers
19 views

Could ultrasound pings and triangulation really help de-scatter diffuse red light for imaging?

Does the science explanation in the latest OpenWater TED talk make sense in principle? The claim involves taking advantage of the doppler effect. Could someone give a more detailed explanation as to ...
0
votes
1answer
21 views

How to visualize the angular frequency in SHM?

Can anyone define how can i visualize the angular frequency(ω) in a SHM y(t)=R sin(ωt+ϕ) (where ω=2π/T).Bcoz we can visualize frequency(f=1/T) as number of times the process is repeated in 1 sec so ...
3
votes
2answers
45 views

Propagation of mechanical waves in vacuum

It is known that, while electromagnetic waves can propagate in vacuum as they do not need a medium, mechanical waves (e.g. sound waves) cannot. However, vacuum has vacuum fluctuations, where (virtual)...
1
vote
1answer
32 views

Waves in rotational motion

If a chain is spun at high speed and let go will that spin on the ground without collapsing, why and how ? If due to a small bump on the road the spinning chain develops a transverse wave what is the ...
1
vote
0answers
19 views

Total intensity of fiber modes

Is it correct to write the output intensity of a multimode fiber resonator as the linear sum of the intensity of the individual modes? The complex amplitude transmission of a fiber resonator can be ...
4
votes
2answers
55 views

Why aren't maximums at 1 wavelength for single slit interference?

I can understand why there are destructive points in single slit interference. It is because the path length difference between the "pairs" of rays have a path length difference of $\lambda/2$. What I ...
0
votes
0answers
19 views

1D string reflection and transmission phase

Ok, I must be missing something very obvious here. After applying the boundary conditions, we can write: $$ A_R e^{i \delta_R} = (\frac{v_2 - v_1}{v_1 + v_2}) A_I e^{i \delta_I} $$ and $$ A_T e^{...
0
votes
3answers
59 views

Polarisation of EM waves

My textbook reads 'The plane of polarisation of an electromagnetic wave is defined as the plane in which the electric field oscillates.' What exactly does this mean? I understand that an EM wave ...
0
votes
0answers
19 views

Elastic wave in isotropic medium

The 2D elastic wave equation is given by: $$ \begin{align} \rho \frac{\partial^2 u}{\partial t^2} &= C_{11} \frac{\partial^2 u}{\partial x^2} + C_{44} \frac{\partial^2 u}{\partial y^2} + (C_{12} ...
0
votes
1answer
24 views

Amount of pressure embodied by a pressure wave (sound)?

I'm looking into a way to calculate the pressure by which a sound wave at close proximity to the target object impacts. My research led me to this physics site (http://hyperphysics.phy-astr.gsu.edu/...
0
votes
0answers
12 views

Waves velocity for a standing wave of a string

I have done a laboratory experience to determine the speed of propagation of a wave in a vibrating magnetic string. To calculate the frequency (f) of oscillation I used an oscilloscope that calculated ...
0
votes
2answers
26 views

Why is the speed of sound in air constant (relative to temperature) when the wave speed formula is Vwave = fλ? [duplicate]

By the logic of the wave speed equation, shouldn't a 1000 Hz sound travel twice as fast as a 500 Hz sound? I know it doesn't, but why not?
0
votes
1answer
21 views

Optical fibers field analysis, $\phi$ dependence not considered

In optical fibers, the core (with $\varepsilon = \varepsilon_1$) is usually represented by a cylinder of radius $a$, whose axis coincides with the $z$-axis in cylindrical coordinates. The cladding is ...
0
votes
2answers
51 views

Is the energy of an electromagnetic wave, in electron volts, an 'average' or a 'peak' value?

Since EM waves oscillate, is the energy given in eV an average or maximum value? In a related question, can a detector (of whatever sort) 'miss' an EM wave if the amplitude is at a minimum when it ...
1
vote
2answers
41 views

Electromagnet produces sound from hollow pipe

I have wrapped around a 80cm metal pipe some copper wire and attempted to produce an electromagnet. The electromagnet works nonetheless from the extremities of the metal pipe a sound is being produced ...
1
vote
4answers
58 views

Can you change the wavelength of light keeping frequency constant and can you do the opposite as well? [duplicate]

Can you change the wavelength of light keeping frequency constant and can you do the opposite as well? I understood the basics but please don't hesitate to go deeper into the concept. Also, If you ...
0
votes
0answers
15 views

Resource recommendation for SHM & Wave [duplicate]

I am looking for good resources or books on Simple Harmonic Motion and Wave that doesn't require any prior knowledge of those topics. Books that consist even the derivation of even the very basic ...
3
votes
3answers
83 views

Examples of non-sine waves? [closed]

What would be a non-sine wave? AFAIK, all sound is a sine wave, equally to waves on the sea. What would be a common example of something in nature that's a wave but not a sine wave? Or, would we have ...
0
votes
1answer
27 views

How to visualize double-slit interference w/ object creating path difference?

A thin flake of mica (n = 1.58) is used to cover one slit of a double-slit interference arrangement. The central point on the viewing screen is now occupied by what had been the seventh bright ...
1
vote
0answers
71 views

Why do we take dx instead of dl here? [closed]

In the derivation of power transmitted along a string in a travelling wave we write $dU=\frac{1}{2}{\omega}^2y^2dm=\frac{1}{2}{\omega}^2y^2{\mu}dx$ Shouldn't dm be written as ${\mu}dl$ insted of ${\...
1
vote
1answer
38 views

Strange strong interference/noise in radio waves [closed]

Good night, Since 2014 when I bought my car I use a FM transmitter inside it to play my bluetooth musics, to escape for every radio in city I put the radio to work in the highest frequency it works ...
1
vote
1answer
30 views

Determining the Frequency of a Gong [closed]

I want to build a circular Gong for Sound Healing and I want a specific frequency but I don't know how to calculate it. Does someone can help me?
0
votes
1answer
48 views

Physics Young's Double Slit Problem

In a Young's Double Slit experiment, the separation of four bright fringes is $2.5\ mm$, the wavelength of light used is $6.2 \cdot 10^{-7}\ m$. If the distance from the slits to the screen is $80\ cm$...
0
votes
1answer
42 views

How does increasing linear mass density affect wavelength?

In a standing wave, we have the equation: $$v = \sqrt{\frac{T}{\mu}}$$ where $T$ is string tension and $\mu$ is linear mass density. By this, if we increase linear mass density, wave velocity will ...
2
votes
2answers
123 views

How does the electron know to “release” the photon at the same angle at which it got absorbed? [duplicate]

This is a quote from Wikipedia: In classical electrodynamics, light is considered as an electromagnetic wave, which is described by Maxwell's equations. Light waves incident on a material induce ...
17
votes
3answers
5k views

Why does sound not move through a wall? [duplicate]

I'm learning a bit about sound and was wondering: If the speed of sound is determined by the amount of matter the source is surrounded with, why doesn't it go through a wall? Example: Speed of ...
2
votes
2answers
53 views

Why are there rings (halos) around street lights? Especially when it's foggy

I was in a car that was turned off last night for some time and the windows became foggy via condensation (moisture droplets building up on one side of window). Looking outside, I could see that ...
0
votes
2answers
51 views

Which waves are produced during tuning fork vibration? [duplicate]

In my book, it is written that transverse waves are produced during physical motion of tuning fork. But vibration of tuning fork produces sound which are compressional in nature . Please tell me ...
0
votes
0answers
34 views

Chladni Plate subjected to different waves

A Chladni plate consists of a flat sheet of metal, usually circular or square, mounted on a central stalk to a sturdy base. When the plate is oscillating in a particular mode of vibration, the nodes ...
19
votes
4answers
5k views

Will tsunami waves travel forever if there was no land?

If there was no land for tsunami waves to collide with, can the waves travel around the globe for forever?