Longitudinal Definition and 129 Threads

Homework Statement A steel pipe of length 60m is hit at one side. a man standing at the other side hears 2 sounds, one that passes in the pipe and one through the air. what is the time difference. Take the modulus of elasticity as 2,180,000[kgf/cm2] Homework Equations Velocity in the...

Basically I am trying to lorentz transform the magnetic field along θ of a bunch particles which have a gaussian distribution to the radial electric field. However the magnetic field in θ is dependent on the longitiudinal distribution. Now initially i thought we would just use the standard LT...

hi, I am running some scientific experiments, and I need a sheet of materials that is extremely good conductor of heat in z axis (through its thickness), I mean it is a good longitudinal heat conductor. I have been doing some researches and some people told me Ni and Mo foils are good at 90...

Hi, The attachment below is about strain rate in fluids*. It shows how the strain rate d\phi/dt is related to the velocity field derivative du/dx when you stretch the element in x (i.e. longitudinal strain). It has no intermediate steps, and I can't see how the angle has been related to...

let me make it clear this is NOT A HOMEWORK.i am just having a doubt. if there is a rope passing through two parallel vertical slits placed close to each other. The rope is fixed and if it's moved up and down perpendicular to its length,transverse waves are generated with vibrations parallel...

in fluid only longitudinal waves propagate but in Ocean water both transverse and longitudinal waves propagate. Does that mean Ocean water is not a fluid? I am confused. Can anyone explain please.(Longitudinal wave is the evidence for Earth core is liquid)

I would like see the reasons why light is not considered as a LWave

A and B leave from a common point and travel in opposite directions with relative speed v. When B’s clock shows that a time T has elapsed, he (B) sends out a light signal. When A receives the signal, what time does his (A’s) clock show? Answer this question by doing the calculation entirely...

Hi! This is a problem regarding a quarter car model driving over a sinusoidal road excitation. A sinusoidal excitation can be written on the form ze^(jωt), z being vertical. I would like to write the longitudinal excitation of a sine wave on the same form? Any hints and tips are much appreciated.

Homework Statement How to find the fundamental frequency of standing longitudinal waves?Are they similar to standing transverse waves? Homework Equations none The Attempt at a Solution I know pretty much about standing transverse waves in strings. But i am confused about standing...

Kittel solid state physics book ( chapter 14)says when dielectric permittivity is zero, then longitudinal polarization wave possibly exists. It is hard to imagine how this is possible. Can anybody explain this? If the permittivity is zero, then there shouldn'n be any response, right? How come...

Hi, I have recently been studying waves, and I understand the transversal wave formula y=Asin(w(t-x/v)) which gives the y coordinate of a point at x along the x-axis in the instant t. However, Wikipedia (http://en.wikipedia.org/wiki/Longitudinal_wave) gives this as the equation for...

Hello. I have got question. We have stick (its diameter is much smaller than its length). When you hit it with a hammer into a corner, some waves will spread, it is clear. However, how do they look? I'm interested in longitudinal oscillations stick. How can draw these wavefront? How their shape...

Problem: In my physics class, we conducted an experiment involving a column of air set vibrating by a tuning fork of a known frequency f held at the upper end. The wave travels from the source to a fixed end (namely the water in the lower end of the tube) & reflected back to the source...

Homework Statement A continuous sinusoidal longitudinal wave is sent along a coil spring from a vibrating source attached to it. The frequency of the source is 25vib/sec, and the distance between successive rarefactions in the spring is 24cm. a) Find the wave speed b) if the max...

Hi All, I am still trying to wrap my head around the five light year stick and the idea that if you push an object, it moves because longitudinal waves of compression force (?) are sent through the medium of whatever the object is made of: https://www.physicsforums.com/showthread.php?t=386687...

Hello, I am looking for research results, report etc. dealing with -aerodynamic efficiency and static longitudinal stability- Couldn´t find anything useful yet! Any ideas would be very much appreciated. Best Regards, granby

Is there a simple way to understand within classical electrodynamics (or QED) the experiments that show longitudinal forces in conductors that are capable of breaking wires when enough current is conducted and are not due to melting or pinch effect?

Homework Statement What must be the stress (F/A) in a stretched wire of a material whose Young's modulus is Y for the speed of longitudinal waves to equal 30 times the speed of transverse waves? Homework Equations Y=\frac{Fl_0}{Al} v_L=f\lambda = \sqrt{F/\mu} v_T = \omega A...

hi All, as the title suggests, I a not so clear on the difference between the two. in particular in solids, I have been looking at various approached to calculating the refractive index. But I´m not so clear on why there is two descriptions of we have a homogeneous medium. thnks!

In my textbook they have introduced the concept of longitudinal waves and go on to explain what a compression and what a rarefaction is.It is written- "In a compression, there is a temporary increase in the density of the medium; and in a rarefaction,there is a temporary decrease in the density...

Hello, is the strain defined as the absolute deformation to the initial ? i.e is it always positive ?? If Yes , then poission's ration is negative for compression of ordinary materials ?

I know this may seem quite trivial but I just want to make sure, do the compressions in a longitudinal wave represent the highest displacement, in a transverse wave this is known as the crest, and do rarefactions represent the equivalent of troughs in longitudinal waves? Thank you in advance

I'm reading about this now. Apparently dividing the expression for the kinetic energy that a slice of air possesses at a point in time by time gives you the rate of energy transfer of the wave. This makes no sense to me.

Hi there, I should probably know this (attempting to do a PhD in physics!) but is there a way to differentiate between longitudinal and shear acoustic waves in a solid? I know that seismologists know which is which by using the time of flight difference for the two types of waves and the...

I have looked everywhere to find a simple, easy test to find whether a wave is longitudinal or transverse, I've read my textbook and I think it may be to do with polarisation but I am not quite sure how, or someone said that passing the wave through a vacuum would determine the type of wave. any...

Hi, I am studying waves and I am having a hard time understanding the following concepts: Wavefronts: I understand the principle. The only thing confusing me is when my teacher was explaining, he drew a light ray and lines perpendicular to that ray and he said those were the crests of the...

I am doing some study into longitudinal wave dynamics. I am using theoretical models of wave motion in continuous bar and comparing this to numerical analysis using a lumped mass model. So far I have discovered that the continuous bar vibrations, caused by base support motion (i.e. vibration...

Why do transverse waves propagate through solids , while logitudinal waves can only propagate through fluids?? I'm still confused about this

As I'm sure many of you know, waves can be either transverse or longitudinal. Transverse waves involve vibrations that are perpendicular to the propagation (direction of motion) of the wave, and longitudinal waves' vibrations are parallel to the wave's propagation. Electromagnetic waves such...

Homework Statement Suppose a thin rod of silver (E = 83 GPa, \rho = 10.5 g/cm3) is joined to a thin rod of gold (E = 78 GPa, \rho = 19.3 g/cm3). Both rods have the same cross sectional area, and a longitudinal wave passes from the silver into the gold. What amplitude will the transmitted...

Does the formula for velocity of the wave = wavelength * frequency hold true for longitudinal waves (like sound wave) also? If yes then we don't find the velocity of sound by any such formula. Moreover, is the wavelength and frequency defined for longitudinal waves?

I am trying to find some sky surveys that have longitudinal data of star magnitudes. The passband does not matter. All that matters is that stars has been observed periodically for a decent amount of time (no surveys with only 9-10 observations per catalogue object). Sadly, the only ones I know...

This minimal-math question may have been answered in other thread(s) but they were too mathematical for me... Feynman explains clearly, with minimal math, that electromagnetic dipole radiation on axis rapidly approaches zero with distance. But I am wondering if there is not measurable...

What causes sound waves to be solely longitudinal in gas, liquid, and plasmas, but enables longitudinal and transverse in solids? Also, does solids only mean crystalline structures or are amorphous materials also able to support transverse sound waves?

longitudinal waves have a crest or not ? I am not sure.

So, the common high school physics example of a transverse wave is a "stadium wave" ... but, I'm wondering if this is actually longitudinal in terms of particle transmission. Each particle (audience member) is only standing up/down. The particles/audience stay in place and don't propagate/run...

My only problem with a basic conceptual understanding of the Quantum Hall Effect is the relation between longitudinal conductivity and resistivity when the magnetic field is such that the filling factor is an integer, and the Hall resistance is quantized. I fully understand the splitting of the...

In the case of the double-slit experiment using electrons, what kind of interference pattern is created? Characteristic to transverse or longitudinal waves? Can we tell only analyzing the interference pattern what type of waves created it? Thanks!

Homework Statement Our lecturer gave us a general equation for velocity of waves; (where c= wave velocity) c= \sqrt{\frac{\textrm{springiness}}{\textrm{massiness}}} (Excuse the terms, I'd personally rather have been given the equations here..) So for transverse waves on a string/wire...

how is aspect ratio of a wing related to longitudinal static stability (LSS)? like, if we increase the aspect ratio, is it going to increase or decrease the longitudinal static stability (LSS)? suppose we have an aircraft whose centre of gravity is fixed at a particular location, if the...

Can anyone provide an elementary argument for why the zero mass of the photon means that it can't be longitudinally polarized? I know of at least one non-elementary argument, which is that if you write down the Proca equation, it only has longitudinally polarized solutions if the mass is...

At the simulators: http://wildcat.phys.northwestern.edu/vpl/waves/wavetypes.html http://www.ngsir.netfirms.com/englishhtm/Lwave.htm The velocity of each particle between two successive collisions is obviously not constant and it is defined by harmonic oscillation equations. What a...

Homework Statement Can somebody please explain me: What does it mean that Longitudinal Stiffness (EA) is equal to infinity? What does it change if for some members of a structure "EA = infinity", and for other members "EA = finite number". Homework Equations I know that we use longitudinal...

Homework Statement In the situations where a transverse or longitudinal wave is propagating through a medium, the medium moves. How do you determine the speed of the medium's motion? When is the medium's speed at a maximum? Homework Equations The speed of the propagating wave is v = frequency...

Hi people, I have a question which i hope you helpful guys/gals can help to shed light on. We all know when we strike one end of a solid metal rod with a hammer sideways (i.e. from left to right), longitudinal vibrations will be set up across the length of the rod. Textbooks and websites...

We have 2 kind of mechanical wave, which is transversal and longitudinal. In calculating the kinetic energy we just integrate dm v^2 of course. Also in calculating the potential energy of an element of a longitudinal wave we can do it by making it as a small spring with a constant k' and just...

Homework Statement The speed of sound in a metal rod is 3600 m s -1. The rod is 1.20m long and clamped at one of its ends. (a) Determine the frequency of its vibration if longitudinal waves are established in the rod and it is vibrating in its first overtone mode. (d) Determine the...

Homework Statement What property of the photon is responsible for the absence of longitudinal polarization? Homework Equations The Attempt at a Solution I thought it is because of the presence of its angular momentum. Is it true?

Can anyone explain how to relate the bunch length and energy spread of a bunch in an electron storage ring to the longitudinal emittance? Also, if you know of a good reference I could use to look up more information I would really appreciate it. Thanks!