Waves Definition and 1000 Threads

Hello, I've been doing some research on gravitational waves since their discovery, and I found that all of the places I looked were missing an important piece of information, that is: What is the mechanism by which angular momentum is being conserved. All of places that I've searched will...

Two stones being dropped into a calm body of water at different times and sizes. The smaller one drops first, sending ripples out. Progressing in time. The second larger stone drops later, creating its own gravitational ripple which is larger than the first. Can the perception of time be altered...

The original question title was too long, so i changed it. My question is: Does the detection of gravitational waves prove the existence of space time? The question may sound odd. I had an argument with one of my friends, who says space time is only a mathematical concept, space does not exist...

My simple description of gravitational waves is that they are due to the relativistic principle of locality, i.e. the fact that the action of gravity is not instantaneous, something that you can’t see from the tidal effects in Newtonian physics. Is it correct? I've also found a comment...

I'd be interested in hearing some thoughts on this. Does the fact that a set of gravity waves were observed imply that some energy, presumably a very small amount, was transferred from the gravity wave to observing instruments? If so, where in the apparatus and how did this transfer occur?

Many popular accounts claim that gravity waves move at the speed of light. Now, I know 2 things: Special relativity says their speed cannot be greater than the speed of light in a vacuum. Gravity is a different fundamental force than the electromagnetic force. The same goes for their fields...

Imagine that there is a stationary source that is propagating waves (such as sound waves). Let's say that the wave speed in the medium is 343 m/s. If I am an observer, and I begin to move towards the waves, will the wave speed increase due to the idea of relative velocities, or will only the...

I just wanted to ask a question, since it went through my mind after hearing about 'gravitational waves' after they have now, apparently, been identified. does everything realease gravitational waves when it collides? Since everything with a mass has gravity, wouldn't that mean that even when...

Dear Sirs My question relates to the recent observation of gravitational waves by LIGO. The paper PRL 116 "Observation of Gravitational Waves from a Binary Black Hole Merger -B.P Abbott et al"" depicts the chirp signal of the wave detected, where it is seen how both frequency and amplitude...

It's quite chilling that gravitational wave has been detected.. can force based explanation of gravity waves still be possible? How? or does it prove 100% that GR is true or gravity is really spacetime curvature?

Hello, I have a basic question about the temporal duration of these newly measured gravitational waves. How long is the duration of these gravitational waves? Two black holes collided and created these gravitational waves a while ago. How long can we "listen" to these waves? When did they...

On a single long string, two sinusoidal pulses are started from either end. They have a destructive interference. Both the pulses have kinetic as well as potential energy. Now the point at which they meet, there being a destructive interference, no crest or trough is formed. But right after...

Does the discovery/confirmation of the existence of Gravitational Waves change or add to current theory in regard to Gravitons?

There seems to be considerable interest in the recent detection of gravitational waves. For the physics community this interest is fully justified. But in the popular press it seems to me to be reaching unjustified and perhaps harmful levels. When one reads overblown hype like: " A giant...

Could someone please describe the recent LIGO project, gravitational waves and their detection in simple terms. PLEASE.

The deadline for nominations for the 2016 Nobel Prize was the end of January. Since the detection and peer-review of the paper was most certainly done beforehand, who do you think is in line for the 2016 Nobel? My bets are on the three gents who spoke/got mention this morning in Washington...

So I heard the news today about gravity waves being confirmed. I really like learning about all the different types of waves and would like to expand my knowledge on gravitational waves. So, do gravitational waves abide by the superposition principle/property? Does anyone suggest a website or...

Could I catch-up to a gravitational wave? Do the same rules apply as with light -- meaning the speed of GRs are frame independent, etc? Thanks.

What are gravitational waves exactly?

Following the new discovery of gravitational waves by LIGO, I just want to make sure I understand the concept of these waves. I believe I currently have a novice understanding of gravitational waves: when a large, fairly sudden change happens to the position of a particle (acceleration or its...

The LIGO paper https://dcc.ligo.org/LIGO-P150914/public puts limits on the dispersion of gravitational waves, which can be interpreted as an upper limit of 10^-22 eV on the mass of the graviton. We all know that low-amplitude gravitational waves are supposed to propagate at c according to the...

http://news.mit.edu/2016/ligo-first-detection-gravitational-waves-0211

Even though light is a transverse wave it travels through air . Why?

Do sound waves increase the temperature of the medium they are traveling through?

Hello! I still would like to thank those who participated to my previous thread about group velocity and dispersion. Now there is a (maybe) simpler question. A sinusoidal, electro-magnetic plane wave in the vacuum propagates in a certain direction with the following wavenumber, which is supposed...

LIGO will apparently announce on February 11, the detection at five plus sigma of gravity waves (3 solar masses of energy worth in about 100 seconds) emitted as two medium sized black holes of about 65 solar masses combined spiral into each other and merge into a single Kerr (i.e. spinning)...

There are rumours that scientists at Advanced LIGO have detected gravitational waves ... it is about 100 years after Einstein predicted they were there in his mathematical theory of general relativity ... Anyone know more about this rumour ...? Peter

Matter has a wavefunction associated to it. But what about light? Does it have both a electromagnetic wave described by Maxwell's equation and a wavefunction described by Schroedinger's equation? Or is the electromagnetic wave considered to be the wavefunction of the photon? I read somewhere...

Homework Statement Alright, this problem has been driving me into a confused rage. The wave is moving in an upward direction so particle A should be moving up as well, right? But every single website I've used to study claims that it's moving in a downward direction. How? Homework...

Each particle has a wave associated to it according to the principle of wave-particle duality. Between two waves there is a phase difference. What is this phase difference in the case of entangled particles? 0 degrees? 90 degrees? 180 degrees? Somewhere in between?

C=130Hz G=196Hz D=293Hz A=440 Hz The distance from the nut to the bridge is 58cm, the amplitude of the string vibration is 2.2mm Part A: What is the period (T) of the G string? Part B: What is the side to side velocity of the g string? (Think simple harmonic motion) Part C: The diameter of the...

1.Homework Statement The wave function for a wave on a taunt string is: y(x,t)=(0.350)(sin(10(π)(t)-3(pi)(x) +(π)/4) where x and y are in meters and t is in seconds. If the linear mass density(μ) of the string is 75.0g/m, (a) what is tha average rate at which energy is transmitted along...

Homework Statement What will be the speed of sound in a perfectly rigid body? Given : In a hypothetical situation we have a rigid body find the speed of sound when it passes through the material. Elasticity of medium = ∞ Homework Equations velocity = √E/ρ ρ = density E = elasticity of medium...

So I was reading our lecture notes about generalising the motion of a string by considering it as a system of N masses, and one of the arguments was that no matter where you are on the string, each mass element will oscillate with the same frequency. This makes intuitive sense for an ideal...

Hi... If we consider propagation of sound through a medium other than vacuum, we mean, when sound is produced by a vibrating speaker diaphragm, it gives periodic jolts to the molecules and atoms present in the medium or air. These "pushes" are transferred to all adjacent atoms until finally few...

what is the definition of phase lag and phase difference in waves and how are these 2 related?please explain in simple words and with real life examples. Please explain phase,phase lag and phase difference from scratch.

Homework Statement Hi, In my textbook, it says that waves superposing to form stationary waves, in addition to being in opposite directions, should have the same frequency and ideally the same amplitude - why the 'ideally' and why is having the same amplitude important? Is it because then we...

how to calculate phase difference for spherical waves?how to say whether they are in phase or out of phase? in sinusoidal we can easily say whether they are in phase or out of phase just by looking at it,but how to do the same for spherical waves?

Homework Statement Two radio antennas transmit identical signals in phase and in all directions of frequency 120 MHz . The distance between the antennas is 8.95 m . Let the origin be at one antenna, and let x be a distance from the origin toward the other antenna. Homework Equations Look at...

Since Edwin Hubble proposed distant galaxies move apart from each other as spectra of each galaxy is shifted towards the red end. this created the law that universe is expanding exponentially since big bang. and these galaxies spectra are due to stretching of wavelength of light incident from...

What variables are maximum at amplitude and equilibrium? What variables are minimum at amplitude and equilibrium? I'm confused about this topic... I know KE is max at equilibrium and PE is max at amplitude.

Hello everyone, I need to calculate the radiant power of an interference pattern of a series of light wave reflections. I need a value in Watts that would plug in nicely into a photodetector's responsivity function (given in Amps/Watts) and thus giving me an estimation of the output current. I...

Homework Statement An unpolarised light beam is shone horizontally through a cubic tank filled with weakly scattering fluid. Can vertically polarized light leave through the sides that are parallel to the beam’s propagation direction? Homework EquationsThe Attempt at a Solution My thinking is...

Homework Statement the equation of a stationary wave produced on a string whose both ends are fixed is given by y= [0.6sin(pi/10)x]cos(600pi)t what could be the smallest length of string?Homework Equations k=2pi/wavelength The Attempt at a Solution i got the wavelength to be 20 but don't know...

I was thinking about a laser, a very strong laser, how does it "burn" things? And what about the microwave oven? What happens in the atomic scale? I know that when something has an increase in temperature the atoms moves quicky because the the temperature is proportional to the kinetic energy...

Homework Statement The tine of a tuning fork, when struck, has an amplitude of 0.25cm. If the frequency is 150 Hz, what total distance with the tine travel in 1.00 min? Homework EquationsThe Attempt at a Solution Not sure how to solve this problem.

I am currently studying a course on waves, which has a real ambiguity in the lecture notes. Essentially, I don't know how the professor got from equation \ref{eq:surf_x-y} to equations \ref{eq:vel_u} and \ref{eq:vel_w}. I have tried to work backwards to find a method but am not sure of its...

I have some questions concerning hydraulic engineering. I'm currently working an simulating laminar flow. This laminar flow is induced by a pressure gradient. The assumed length is 1 meter, therefore the pressure gradient is equal to the actual pressure in reference with zero. What are typical...

I have two questions which has been troubling me: 1. How can we say that meaning of e^(jkR) is a spherical wave traveling in negative R direction. It can be viewed as polar form of vector with magnitude 1, but how a spherical wave? 2. When we take instantaneous value of a complex quantity , why...

I'm trying to understand how a vibrating body produces oscillations in sound pressure. I've been through derivations and solutions of the wave equation for a string, but I don't understand the transition from waves on a string to sound pressure waves. How are the waves on a string or drum...