What is Waves: Definition and 1000 Discussions

The United States Naval Reserve (Women's Reserve), better known as the WAVES (for Women Accepted for Volunteer Emergency Service), was the women's branch of the United States Naval Reserve during World War II. It was established on July 21, 1942 by the U.S. Congress and signed into law by President Franklin D. Roosevelt on July 30. This authorized the U.S. Navy to accept women into the Naval Reserve as commissioned officers and at the enlisted level, effective for the duration of the war plus six months. The purpose of the law was to release officers and men for sea duty and replace them with women in shore establishments. Mildred H. McAfee, on leave as president of Wellesley College, became the first director of the WAVES. She was commissioned a lieutenant commander on August 3, 1942, and later promoted to commander and then to captain.
The notion of women serving in the Navy was not widely supported in the Congress or by the Navy, even though some of the lawmakers and naval personnel did support the need for uniformed women during World War II. Public Law 689, allowing women to serve in the Navy, was due in large measure to the efforts of the Navy's Women's Advisory Council, Margaret Chung, and Eleanor Roosevelt, the First Lady of the United States.
To be eligible for officer candidate school, women had to be aged 20 to 49 and possess a college degree or have two years of college and two years of equivalent professional or business experience. Volunteers at the enlisted level had to be aged 20 to 35 and possess a high school or a business diploma, or have equivalent experience. The WAVES were primarily white, but 72 African-American women eventually served. The Navy's training of most WAVE officer candidates took place at Smith College, Northampton, Massachusetts. Specialized training for officers was conducted on several college campuses and naval facilities. Most enlisted members received recruit training at Hunter College, in the Bronx, New York City. After recruit training, some women attended specialized training courses on college campuses and at naval facilities.
The WAVES served at 900 stations in the United States. The territory of Hawaii was the only overseas station where their staff was assigned. Many female officers entered fields previously held by men, such as medicine and engineering. Enlisted women served in jobs from clerical to parachute riggers. Many women experienced workplace hostility from their male counterparts. The Navy's lack of clear-cut policies, early on, was the source of many of the difficulties. The WAVES' peak strength was 86,291 members. Upon demobilization of the officer and enlisted members, Secretary of the Navy James Forrestal, Fleet Admiral Ernest King, and Fleet Admiral Chester Nimitz all commended the WAVES for their contributions to the war effort.

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  1. Danny Boy

    I Why is reflection coefficient defined this way

    In Griffith's "Introduction to Quantum Mechanics, second edition" he states: For the delta-function potential, when considering the scattered states (with E > 0), we have the general solutions for the time-independent Schrodinger equation: $$\psi(x) = Ae^{ikx} + Be^{-ikx}~~~~\text{for }x<0$$ and...
  2. sebas

    I have a question about a problem related to waves in a rope

    Homework Statement A uniform rope with length L and mass m is held at one end and whirled in a horizontal circle with angular velocity You can ignore the force of gravity on the rope. (a) At a point on the rope a distance r from the end that is held, what is the tension F? Homework Equations...
  3. D

    Magnetic Field of Spherical Electromagnetic Wave

    1. The problem statemeent, all variables and given/known data The field electric's electromagnetic wave issued by a strut isotropic source is: \vec{E} = E_{0} r_{0}*cos(ωt − kr) \vec{θ} Find the magnetic field in spherical coordinates Homework Equations I think, i use the equation \vec{B} =...
  4. K

    I Gravitational Waves: Time, Synchronization, Speed

    Hi folks. I see there is a similar thread on grav waves and time, but I have a few specific questions. Everyone talks about grav waves "in space" -- even Brian Greene was saying this on Colbert, whereas Colbert was saying spacetime. I would like to make a video on how GWs are indeed "waves in...
  5. R

    I Do gravitational waves transmit energy in all cases?

    I was told that there are two kinds gravitational waves. One dies out as 1/r, another one dies out as 1/r^2. The former is what LIGO detected, the latter is not. While I trust the professional qualification of the person very much, as a non-physics professional, I would like to a second person...
  6. D

    Understanding Linear Momentum of Waves with No Mass

    Hi people, I studying electromagnetic waves (intermediate) and I don't understand how the expression for linear momentum of a wave is obtained, if the wave doesn't carry any mass. In particular, I have to explain why the radiation pressure on a perfect absorber is half that on a perfect...
  7. S

    Displacement-distance vs Displacement-time graphs for waves

    Hi guys, I'm finding it hard to conceptualise the difference between a displacement-distance and displacement-time graphs for transverse waves. Could somebody explain the difference please?
  8. P

    EM Wave: Phase of the electric and magnetic waves?

    In a vacuum, the plane wave solutions to Maxwell's Equations are... E=E0*cos(wt-kr) B=B0*cos(wt-kr) ie they are in phase. (See for example https://www.physics.wisc.edu/undergrads/courses/spring08/208/Lectures/lect20.pdf http://hyperphysics.phy-astr.gsu.edu/hbase/waves/emwv.html ) I don't...
  9. R

    Are Gravitational Waves and Waves Transmitting Curvature Changes Different?

    G-Waves is a buzzword recently :) At the beginning I thought G-waves as the propagation of the changes of the curvature caused by a mass when the status of the mass (e.g. value or location) changes...But moment ago, I was told that G-waves are different from the waves that transmitting the...
  10. S

    A Spacetime Engineering by Superposition of GWs: Feasible in Theory?

    I wanted to post the conjecture from this new paper which has recently been published within this past month - here's a direct link to the paper: http://arxiv.org/pdf/1602.01439v1.pdf Could an experimental apparatus consisting of oscillating masses be used to generate miniscule gravity waves...
  11. G

    I Gravitational Waves & Gravitational Pull: Explored

    According to the sticky bead argument, gravitational waves do carry energy. As such, are they, like photons (EM waves), subject to the gravitational pull of planetary bodies?
  12. G

    Gravitational Waves: Were They Stronger Long Ago?

    In order to detect gravitational waves at our present time and location, aLIGO has required a mind-boggling sensitivity, if I understand well it can detect variations in length in the order of 1/10,000 of the diameter of a proton. But space has stretched a lot during the universe's history. If...
  13. M

    Recording gravity waves over the noise floor

    I'm curious as to how the gravity waves were recorded given how small the amplitude of the wave was/is. Was it not below the thermal noise floor? Were noise removal techniques used, etc? Also, what kind of sampling rate/bit depth was used? Thanks
  14. Cuboctonion

    Q&A: LIGO Gravitational Wave Detection

    I have a couple of questions regarding the new detection of signals believed to be gravitational waves at LIGO 1. Two similar signals were detected at both facilities. Why does the Livingston signal appear to be weaker than the Hanford signal? 2. The signal in Livingston was reported to have...
  15. J

    Gravitational Wave Discovery & Einsteinian Gravity: What's the Connection?

    Hi Everyone, my first post here. I'm really confused by the comments around the recent LIGO gravitational waves discovery and how it connects to Einsteins gravitational model. My understanding is that he said a body warped spacetime around it forming a gravitational well into which other bodies...
  16. jerromyjon

    Is there a connection between sound waves and gravity waves?

    I'm curious if there is any relation between sound waves and gravity waves. I don't mean as an analogy. I mean can the speed of sound in matter be derived from the energy of gravity waves.
  17. B

    Why are electromagnetic waves not visible themselves but....

    Why are electromagentic waves not visible itself but visible if they are reflected by an object ? Assuming a source of light emitting photons. This waves are not visible in the dark. If they end up on a surface of any object which "reflects" the light we start to see the object. What happens at...
  18. It's me

    Velocity of propagation of an EM field in vacuum

    Homework Statement In a region of empty space, the magnetic field is described by ##\vec{B} = B_0e^{ax}\sin{(ky-\omega t)} \hat{z}##. Find the speed of propagation ##\vec{v}## of this field. Homework Equations ##\Delta \vec{B} = \frac{1}{v^2}\frac{d^2\vec{B}}{dt^2}## , ##k=\frac{\omega }{...
  19. Greg Bernhardt

    Coffeeshop Astrophysics Meeting on Gravitational Waves

    In about an hour I'm heading over to a local Coffeeshop Astrophysics meeting put on by researchers and grad students at UW-Milwaukee. The topic is the gravity wave discovery. Apparently some of them contributed to the LIGO project so it will be interesting to hear what they have to say. I'll...
  20. radio171

    Where do electromagnetic waves get their energy from?

    We know that EMW are generated by accelerating charges. If I accelerate a charge it should gain kinetic energy equal to half the mass of the charge times velocity squared. But at the same time it will radiate electromagnetic waves which carry energy itself. So where does this energy come from...
  21. M

    Gravitational Waves: Definition & General Overview

    What are gravitational waves in general, not just in the weak field/linearized theory?
  22. S

    Gravitational Waves and Frame-Dragging

    I'd like to ask whether the Lens-Thirring effect, which is also known as Frame-Dragging, produces any kind of Gravitational Waves which might be detectable by a detector more sensitive than LIGO. There was of course the Gravity Probe B experiment not too long ago, which saw gyroscopes launched...
  23. G

    B Gravitational Waves prediction

    Dear Friends! Q.There was no direct evidence of binary black holes till September 14,2015,when signals coming from about 1.3 billion light years away were captured by LIGO. Now my question is that how in advance we knew about the specific colliding pair.Did we theoretically predict the graph...
  24. Ontophobe

    Questions About Gravitational Waves

    1. If the Michelson-Morley experiment were to be conducted with gravitational waves instead of light waves, would the results be any different? 2. Ought we to expect the existence of "gamma" gravitational waves and "radio" and "microwave," etc. gravitational waves? In principle, could there be...
  25. davidbenari

    Energy in EM Waves: Is E-field Approach Equally Valid?

    I wanted to know if my reasoning is considered sound, and if not please tell me the loopholes you can observe. The energy density in an EM field is (Its not necessarily a plane wave we're talking about here). ##u= \frac{\epsilon E^2}{2}+\frac{B^2}{2\mu} ## The relationship ##E=cB## is...
  26. T

    Gravitational waves, distance and space-time

    So the discovery of gravitational waves observed a contraction and stretching of space-time, and I've been trying to understand how the expansion of the universe means that space itself is growing. I want to understand how this actually works in relation to 'things' like a photon and an atom...
  27. T

    I Can Matter Absorb Energy from Gravitational Waves?

    So everyone knows that the energy of a photon is E = hf, I assume this is just because light also has a particle nature. But how do we calculate the energy of a gravitational wave, because from memory classical wave equations have a mass component to calculate 'kinetic' associated energy, and I...
  28. T

    Proper movement, reference frames and gravitational waves

    Hi, So apparently electrons don't orbit the nucleus of atoms so I'm assuming the lack of movement means that no energy from the atom is radiated away from an atom due to minuscule gravitational waves, over the life of the universe. But gravitational waves have got me thinking about reference...
  29. G

    Gravitational waves speed in a medium

    Electromagnetic waves are known to travel a c in a vacuum, but at lower speeds in a material medium. What about gravitational waves? They are also predicted to travel at c in a vacuum, but what about them traveling through material mediums? Do they get slowed down? by which factor? TX
  30. pioneerboy

    EM length of gravitational waves

    Maybe a stupid question and maybe sensless to ask, but as I don't know, I ask anyway: what is the length of the newly found gravitational waves in terms of traditional EM wavelengths?
  31. F

    Derivation of the speed of sound waves equation

    I'm learning about the speed of sound waves through a medium. The derivation is initiated through Impulse=change in linear momentum (I=Δp), then I=ΣFΔt=(Area×Δpressure×Δt) in the x direction The derivation proceeds by replacing the Δpressure with another equation we had derived earlier...
  32. S

    Gravitational Waves, Gravitons: Does Discovery Change Odds?

    Now that we have confirmed the existence of gravitational waves, have the odds of discovering a force carrying particle changed? With my limited knowledge it kind of seems like if gravity is caused by the warping of space-time, which was confirmed by gravitational waves, would mean that there is...
  33. bcrowell

    Unresolved background of gravitational waves?

    The aLIGO signal is a discrete event. In addition to such events that can be resolved into individual chirps, I would think that there would be a background of gravitational waves that would look like noise, but that could be distinguished from terrestrial noise (trucks passing by, etc.) because...
  34. G

    Gravitational Waves research and Dark Matter

    A lot is being written about the recent aLIGO observations and in general the implications of GW research for our scientific understanding of the universe. We read about mostly 2 grand areas where GW research can provide novel knowledge. The astronomical / astrophysical area (i.e. mapping...
  35. B

    Thought experiments about Gravitational Waves

    Imagine a mass that disappeared from space. I know that it is impossible, but imagine it is sucked by a wormhole or it just disapperars. Will we detect ONE gravitational wave only? Like a pulse and nothing else? Now the other way around. A mass appears from nothing. Then we will detect one...
  36. DaveC426913

    Exploring Gravitational Waves: Feeling 10cm Distortion at 1LY

    Someone has raised an interesting discussion about how one might experience these waves closer to the merging BHs. (Let's assume we're in a heavily-shielded spaceship that will protect us from all EM radiation and other effects except gravity.) First, how big? My back of napkin calculations...
  37. anorlunda

    Damping of Gravitational Waves

    Like many others, LIGO made me curious about gravitational waves. I found the paper: Nonlocal Gravity: Damping of Linearized Gravitational Waves http://arxiv.org/abs/1304.1769 I'm having difficulty understanding. Does that mean that damping is implicit in the terms of the tensors? Does it...
  38. MartinMb

    Gravitational waves, compensate for the Earth's movement

    How is it possible to compensate for LIGO's movement in the recent measurement of Gravitational Waves? I can understand that we are able to measure something to a tiny fraction of a proton when the subject and observer are both moving relative to each other through space but how is it possible...
  39. K

    Electromagnetic Waves: Electric & Magnetic Fields

    Is it correct to say a varying electric field creates a magnetic field and vice-versa instead of saying that a charge creates such fields?
  40. S

    I Gravitational waves due to Big Bang?

    The recent observed gravitational wave is claimed due to two merging black holes colliding or infusing into each other. Could it be just another local Big Bang? (Of course I am implying Big Bang occurs in various scales). So "our Big Bang" was a large scale Big Bang and was triggered by two...
  41. E

    Young's equation and longitudinal waves

    Hi I have learned at school that we can use Young's equation Lambda = ax/D to calculate the wavelength of light from an interference pattern I'm wondering if this equation also works for longitudinal waves? Thank you for your help
  42. DaTario

    Oscillating masses and gravitational waves

    Let me ask one simple question. For less than a thousand dollars one can buy an apparatus which can provide experimental evidence for the gravitational attraction between two masses of one kilogram each, placed at distances of the order of ## 10^{-1} m ##. By making one of these masses to...
  43. J

    Electromagnetic waves and polarity

    Say you have a transmitting whip antenna. If you send a quick DC burst into it, you will get the electrons in the antenna accelerating in one direction like this: If that EM wave is then absorbed by a receiving whip antenna, the electrons will also move in one direction. The polarity of the EM...
  44. T

    Question about cause of gravitational waves

    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...
  45. Densedog

    A Perception of time, gravitational waves.

    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...
  46. RandAlthor

    B Gravitational Waves & Space-Time: Is There Proof?

    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...
  47. G

    Gravitational Waves vs Tidal Effects: Exploring Nature & Inflation

    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...
  48. N

    Gravity Waves: Energy Transfer from Observation

    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?
  49. Mark Harder

    Speed of Gravity Waves: An Unmeasured Assumption?

    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...
  50. Mr Davis 97

    Does the Doppler Effect Affect Wave Velocity in Moving Observers?

    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...
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