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. harambe

    B The Wave Equation and Traveling Waves

    The wave equation in one space dimension can be written as follows: .A traveling wave which is confined to one plane in space and varies sinusoidally in both space and time can be expressed as combinations of What is the difference between these two wave equations?? And is traveling wave always...
  2. T

    I Does Hyugen's principle apply in three dimensions?

    Does Hyugens principle apply in three dimensions ? If a surface wave (for simplicity an ocean wave) is propagating along the x-axis we know that this wave ray is a point source for wavelets on the y-axis but what about the z axis? If this diagram was 3d would we see a spherical wave front...
  3. T

    Photoelectric effect , Superposition of sine waves

    Homework Statement In a photoelectric effect experiment, a monochromatic plane wave of light falls on a metal plate. The electric field in the light wave at a point near the plate varies according to E=E_0 \cos (\omega t). This results in a saturation current of 6 μA. If instead, the light wave...
  4. C

    MATLAB Coding angular spectrum of waves in a fluid

    Hi, I am trying to code ultrasonic transducer radiation in water using angular spectrum of plane waves. I am having difficulties in the sampling and fft. If anybody has an idea about this can you please help me out? I can paste the code once i get some response. Thanks for your help!
  5. Matt Chu

    Proving a complex wave satisfies Helmholtz equation

    Homework Statement Consider a harmonic wave given by $$\Psi (x, t) = U(x, y, z) e^{-i \omega t}$$ where ##U(x, y, z)## is called the complex amplitude. Show that ##U## satisfies the Helmholtz equation: $$ (\nabla + k^2) U (x, y, z) = 0 $$ Homework Equations Everything important already in...
  6. Matt Chu

    Proving a wave satisfies the Helmholtz equation

    Homework Statement Consider a harmonic wave given by $$\Psi (x, t) = U(x, y, z) e^{-i \omega t}$$ where ##U(x, y, z)## is called the complex amplitude. Show that ##U## satisfies the Helmholtz equation: $$ (\nabla + k^2) U (x, y, z) = 0 $$ Homework Equations Everything important already in...
  7. C

    Finding the Mass of a Hanging Rope (Wave Problem)

    Homework Statement "...you were presented with a geologist at the bottom of a mineshaft next to a box suspended from a vertical rope. The geologist sent signals to his colleague at the top by initiating a wave pulse at the bottom of the rope that would travel to the top of the rope. The mass of...
  8. T

    Mechanical waves encountering a change in Density

    Suppose a ocean wave encountered a section of ocean which had a higher level of aeration from gas such as methane escaping from the seafloor. Due to the aerated sections apparent lower density would the wave travel slower through the aerated section than its propagation speed thru pure seawater ?
  9. L

    B If electrons are waves, what causes them to change direction?

    If electrons are waves, what causes them to change direction and move up and down?
  10. mfb

    I Observation of Alfvén waves heating the Sun's corona

    The corona is much hotter than the surface of the Sun, contrary what you would naively expect from the heat flow. While plasma waves were long suspected as cause, the mechanism was not well understood. How are these waves produced, and how is their energy converted to heat? Scientists now...
  11. A

    B How do the group and phase velocities of pilot waves compare?

    How fast are the de Broglie pilot waves? Do they move at the particle group or phase velocity? Is the phase velocity really faster than c as it weaves around the particle?
  12. D

    Reflection/transmission of waves at interfaces

    Hi. I am using r and t to denote the amplitude reflection and transmission coefficients and R and T to denote the power reflection and transmission coefficients. 1. If r = -1 this is total reflection which leads to standing waves. But if the reflected wave has an equal but opposite amplitude why...
  13. C

    EM waves in phase and E/B = c question

    My textbook (Serway and Jewett, Physics for Scientists and Engineers) says that Emax/Bmax = E/B = c. And that E and B are in phase. My question is, if they are in phase, they both reach zero at the same time. At that point, E/B = 0/0 and not c. I know I am missing something, but not sure what...
  14. K

    Sound waves produced by an aircraft

    Suppose that an aircfract somehow is not moving. Then I would expect the sound waves it produces to spread out uniformely in a spherical fashion. Now imagine a airplane traveling at approximately the speed of sound. In this case, if the airplane produces a wave at point A and after a time T the...
  15. S

    I Is there a frequency cutoff for Debye theory of capillary waves?

    I calculated the energy density of capillary waves with Debye method (pretty much Debye model in 2D), and I assumed there is a frequency cutoff for capillary waves as well. However, when I checked my work with solution I was quite surprised that the solution suggests there is no such a cuttoff...
  16. K

    What charges generate EM waves in free space?

    as we know light travel in vacuum because of oscillation of electric and magnetic field and both are perpendicular to each other. But i don understand how these electric and magnetic fields get generated in vacuum. as electric filed can vary by oscillating charge and that generate varying...
  17. M

    Buoy in waves problem (Feynman)

    Hi all, would appreciate a spot of help on this problem which originally comes from Feynman's introductory physics course. 1. Homework Statement 'A spar buoy of uniform cross-section floats in a vertical position with a length L submerged when there are no waves on the ocean. What is the...
  18. PumpkinCougar95

    Confusion about the Energy Density of EM waves

    I am a bit confused about the energy density in an EM wave. why do we take the Peak value of E vector while calculating the energy density? Like if the E field is ##E_0 Sin(kx-wt)## what is the energy density of the EM wave(Magnetic + Electric)? is it A) ##\frac {e_0E_0^2}{2} ## or B) ##...
  19. R

    I I understanding the meaning of Bloch waves

    Before reading Bloch theorem i read something to get a feeling to what happens to the energy of electron in a periodic potential, in short what i read said: Assuming we have a weak periodic potential from -π/a to π/a for example cos(2πx/a), we can write the electron wave function as: α|k>+β|k'>...
  20. Physics345

    Cell Phone EM Waves - Health Risks & Physics Explained

    Homework Statement A cell phone sends and receives electromagnetic waves in the microwave frequency range. a) Explain the physics of how an oscillator creates these waves. b) Research the possible side effects of using cell phones. citing at least three websites that you consider reliable...
  21. Jianphys17

    I Are fundamental particles like electrons and protons truly matter waves?

    Hi at all, I've the following question: How the fondamental particles (electrons, protons) are seen as matter waves, what shape and size should be these waves? They are wave-packets?
  22. T

    Finding minimum and maximum intensity of waves

    Homework Statement Two loudspeakers are placed 3.00 m apart horizontally.They emit 425 Hz sounds, in phase. A microphone is placed d= 3.20 mid distant from a point midway between the two speakers, where an intensity maximum is recorded. (a) How far must the microphone be moved to the right to...
  23. Hammed

    Circularly polarized waves as an orthonormal state

    Homework Statement Show that any plane wave can be written as the sum of a left-circularly polarized wave and a right-circularly polarized wave of suitable amplitudes and phase Homework EquationsThe Attempt at a Solution If I assume the plane wave polarizes in the z direction. It is possible...
  24. F

    Predicting Changes in Interference Patterns using Laser Interference Equations

    Homework Statement Imagine that you are conducting an activity with a laser to create an interference pattern. Use the appropriate equations to predict two ways (other than the way described in the following example) to change the interference pattern in order to have closer fringes. Explain...
  25. B

    The difference between angular frequency and frequency?

    I looked up and read the definitions in several different books, but still don't get it. Is someone willing to explain it to me on a really simple level?
  26. P

    Is this answer incorrect for cancelling waves?

    Homework Statement A wave is traveling to the right shown in the first picture. Which wave traveling to the left will momentarily cancel out the original wave moving to the right? Homework Equations There are no equations, this problem is visual The Attempt at a Solution It seems the...
  27. M

    How long can electromagnetic waves last?

    Hello, I am reading a book on the history of the universe. The book says that we can still detect the electromagnetic waves generated at the big bang in the form of white noise. I am not sure how it works, because the waves transmitted by AM or FM radio antennas die down after propagating some...
  28. arupel

    A Gravitational Waves: Verification Accuracy & Physicists' Opinions

    From what I understand the LIGO experiments were the first in the road to demonstrating the existence of gravitational waves. There was a dicussion about this on Utube where someone pointed out that the polarized light scattered from dust, being much larger, could mask the the effect of...
  29. F

    I Guitar Playing and Standing Waves

    Hello, The guitar is a stringed instrument with six strings of equal length but different linear mass density. Fretting is about shortening the length of a string which causes the fundamental mode and higher modes to have higher resonant frequencies. When a guitar string is plucked (by hand...
  30. doglover9754

    How do sound waves interact when two radios are facing each other?

    So again, I’ve got this analytical question on my mind and it’s been bugging me for a couple weeks now. So my question is, how do sound waves work? I’m talking about if you put two radios facing each other playing different songs. What would happen? Is it if waves match then they just combine...
  31. I

    Two States of Polarization of EM Waves

    I am studying about the cavity radiation inside a metallic cube. In the textbook it states that there are two independent waves corresponding to the two possible states of polarization of electromagnetic waves. What does it mean by this? (My current assumption is the phase change of the waves)...
  32. F

    Looking for feedback on selecting a good topic

    Homework Statement Choose a technology such as MP3 players, laser, medical imaging, or another that interests you (Other than the cell phone). Research the internet and find out how it is related to the physics of light and waves. In approximately 100-150 words, write a paragraph explaining the...
  33. E

    Interference of Multiple Waves: How to Determine Phase for Maximum Intensity?

    Homework Statement Four identical wave sources (s1,s2, s3,s4 ) are located at the corners of a square. We know the phase at three sources: 0 at s1, π/4 at s2, π/2 at s3. Whet is the phase we have to give to s4 in order to have a maximun of intensity at the center of the square? Homework...
  34. K

    Ultrasound waves and the kidney

    Homework Statement In a kidney study, ultrasound was used with frequency 3.5 MHz. In normal body tissue, the speed of the ultrasound is 1.50 km / s, while the speed in the kidney tissue is 1.55 km / s. Reflected signals came as follows: after 20 microseconds from the skin, after 75 microseconds...
  35. S

    I Incoherent Waves: Interference Possible?

    Is interference of incoherent waves possible?
  36. S

    I Gravitational Waves vs Universe Expansion Rate

    Is there any relationship between the Speed of gravitational waves and the Universe's "local" expansion rate? Speed of gravitational waves is supposed to be equal to the speed of light. Gravitational waves don't travel faster than light. But we can observe far galaxies moving away from us with...
  37. N

    Sound Intensity Propagation and Sound Waves

    Hello everyone, I'd ask you through an illustration which for me would be more clear to put questions I wrote in the image: Thanks to all! Cheers Luigi
  38. H

    Eye's response to electromagnetic (light) waves?

    Does the eye's retina, rods and cones detect the E or B or both components of a lightwave? I've not been able to find much Googling. Thanks Hank
  39. S

    Standing Waves (Instruments) & Interference interpretation?

    Hi, I'm trying to solve two problems related to standing waves and wave interference; while I'm not having difficulty with the actual solving portion, I don't know if I'm interpreting the questions correctly. Question 1: "A violin string is tuned to 460 Hz (fundamental frequency). When playing...
  40. ISamson

    B Light, Photons, Waves, Particles: Wave-Particle Duality....

    Me and my friend have recently (half a year ago) had a huge debate, between ourselves, about the wave-particle duality. We took sides in light being a particle or a wave. I was for particle he was for waves. At the end of a hot-filled week of arguing, the debate ended up with the acceptance of...
  41. T

    Understanding Expansion Fans and Reflected Waves in Propulsion Systems

    "For simplicity, let us assume the flow turns around a corner downstream of the throat, where the Mach number is M0 > 1, to an angle θ1, and let us indicate just three of an infinite number of waves making up the "expansion fan". Since the centerline is an axis of symmetry, the waves must...
  42. T

    Show the Fourier transformation of a Gaussian is a Gaussian.

    Homework Statement Show, by completing the square in the exponent, that the Fourier transform of a Gaussian wavepacket ##a(t)## of width ##\tau## and centre (angular) frequency ##\omega_0##: ##a(t)=a_0e^{-i\omega_0t}e^{-(t/\tau)^2}## is a Gaussian of width ##2/\tau##, centred on ##\omega_0##...
  43. T

    How Can I Broadcast a Message Into Outer Space Using Radio Waves?

    Hello! I have been thinking of broadcasting a message into outer space. It sounds silly, I know, but that's just something I'd like to do for and with my niece. She's 8 years old and very interested in physics (as far as she understands it). I have some knowledge in electronics, I think I...
  44. V

    I Gravitational Waves Affecting EM Fields: Evidence & Implications

    Suppose a gravitational wave propagating through space encounters a strong magnetic field (for example the wave might pass through a magnetar with a B field strength of 10^{11} Tesla). Would there be any observable perturbation in the magnetic field itself? In other words would the gravitational...
  45. V

    B Two waves moving at right angles go in circles?

    ylet x = Asinx, y = Acosx, apparently x^2 + y^2 = A^2 so this combination goes in circles. wot? creating waves in a pool 90 degrees off and out of phase by 90 will make it move in circles? I'm skeptical, anyone have a video of an experiment that demonstrates this?
  46. L

    B Implications of gravitational waves from the Big Bang?

    My understanding is that gravitational waves have not been detected from the proposed inflationary epoch of the big bang, only from the merger of two super massive objects. Is that correct? Are GWs predicted from the big bang in models where there is no inflationary epoch? If GWs are detected...
  47. C

    B Node at a closed end and an antinode at a open end of a tube

    What causes there to be a node at a closed end of an air column and an antinode at the open end of a air column? Why doesn't it change as the wave oscillates?
  48. R

    I Is this book correct regarding waves in even dimensions?

    http://imgur.com/cUNs2z7 In this book I found by chance on Google, the author claims that “solutions of the wave equation only take the form of functions (...) in one and three dimensions. In two dimensions solutions are more complex”. Then, at the end of the paragraph of interest (which I...
  49. T

    Maximum frequency if there is to be one diffraction order

    Homework Statement A naval towed-array sonar comprises a line of ##80## transducers, equally spaced over a total length of ##120 m##, that is towed behind a ship so that it lies in a straight line just below the surface of the water. An adjustable phase delay can be introduced electronically...
  50. J

    The relation between photons and waves

    Hi everyone! Sorry for the bad English! Please, I learned that a wave is something the photons "surf" on, like, in one electromagnetic wave, can have many photons. So, is this true? Like, I though that one gamma ray and an infrared photon would ride different waves... More: the light from the...
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