What is Acoustic waves: Definition and 19 Discussions

A surface acoustic wave (SAW) is an acoustic wave traveling along the surface of a material exhibiting elasticity, with an amplitude that typically decays exponentially with depth into the material.

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  1. Daniel Petka

    I Why singing a note while playing a note creates a difference frequency

    If you play a note of a certain frequency on a flute and simultaneously sing a note at a different frequency, then you create a third frequency that wouldn't be there if you play or sing in isolation - and the frequency of this subharmonic is the difference of the flute frequency and the voice...
  2. Daniel Petka

    I Why is saxophone growling produced by modulation of the sound waves?

    My clarinet teacher once showed me a trick: you can play any note and then sing a fifth above that note and it will create the illusion of sounding an octave deeper. On a different sub, I asked about this technique: It turns out that this is called saxophone growling. And it's no coincidence...
  3. Slimy0233

    I Understanding the propagation of sound on molecular Scale

    I am actually an undergraduate in Physics but I didn't understand this basic phenomenon. I saw this youtube video today and I was wondering how molecule in air would be able to regain it's initial position after it has transferred it's energy to the adjacent particle. Is it like a rebound, it...
  4. bubble-flow

    Where are the pressure nodes on a standing acoustic wave in water?

    I have calculated the wave length of a 36 kHz acoustic wave in 20 °C water to be around 41.16mm. Suppose I have a transducer that produces a 36 kHz acoustic wave and a small water container with a length of 41.6 mm. How will the standing acoustic wave look like, which is produced by the...
  5. Cathr

    Accoustic waves notions (propagation in a tube)

    Please help me with this problem I am facing, I am lacking notions of acoustics and I would be very grateful if someone could clarify them: A tube has a revolution symmetry arounf the ##x## axis and has a section dependent of the value of the abscissa (x), so the profile ##S(x)## is known. The...
  6. C

    Validity of Acoustic Weapon Effects

    Note: this is a re-post from the physics area because this thread is probably more appropriate for this content. There is a lot of rather contradictory information present on the biological effects of acoustic weapons with a bevy of scientific articles claiming that they cause harm to...
  7. N

    Reflection and Transmission of acoustic waves at a boundary

    Homework Statement An interface is formed between a block of aluminium (density = ##2.70 \times 10^3 kg/m^3##, speed of sound =##6.40 \times 10^3m/s##) and a block of copper (density = ##8.96 \times 10^3 kg/m^3##, speed of sound =##4.76 \times 10^3m/s##). Longitudinal waves traveling through...
  8. Alfreds9

    Finding the acoustic point in a valley

    Hello, I have a practical problem, I'd like to find the "best" spot to hear sounds in a valley (forgive me if "acoustic point" isn't an appropriate term, I just couldn't come up with anything better and scrolling an acoustics text didn't help), or at least a non-blind spot (one which instead...
  9. Phil Freihofner

    I Standing wave in cylindar vs cone

    I have been trying to understand why two woodwind bore shapes behave so differently. My understanding is that one end of a woodwind is an antinode (driven by the reed of the instrument) and the other end is a node (where the tube is open to the atmosphere). a - - - - - - - - - - n In the...
  10. NPB777

    Ultrasound Transducers and Simulator

    Presently I am working on Underwater Acoustic Wireless Transmission. I desire to measure water parameters at the bottom of the surface of the water and then pass it to the water surface using Ultrasound. There will be a buoy at the surface which is half submerged and half floating. The floating...
  11. Shahab Mirza

    How to interpret this Wave Equation (Derivation) Help ?

    Hi dear people , Hello I waw studying super position of two Sound Waves , traveling in same medium with same frequency , same wavelength and same amplitude while differing in phase . quick derivation : Wave 1 displacement y1= A sin (kx-vt ) and wave 2 displacement y2= A sin (kx-vt-phase...
  12. R

    Why Do We Use the Complex Conjugate of Velocity to Calculate Acoustic Intensity?

    Hello All, I would like to know why do we multiply the complex conjugate of velocity (not just the velocity) with the complex pressure to obtain the complex acoustic intensity. Could someone please help me with this? Regards, Radel...
  13. bartekac

    Acoustic waves - factors determining their form

    Hi, I am not a native English Speaker, so some words might not be appropriately used below, but I will try my best to explain what I was thinking about. In general, I have never learned how acoustic waves emerge microscopically. The application of the theoretical knowledge I acquired was always...
  14. H

    Are Faraday waves acoustic waves?

    Hi, I am confusing if capillary-gravity waves (Faraday waves) belong to a type of acoustic waves stricto sensu? What's the difference between Faraday standing waves and acoustic standing waves (interference) at the the air-liquid interface. Thanks harmonyU
  15. J

    Separating Acoustic Waves from Background Reflections

    I'm trying to classify materials based on the reflected acoustic wave they produce. One transducer sends out an ultrasonic pulse to the material of interest and another transducer picks up the reflected waveform. Some of the wave is transmitted thru the material and reflected off of the...
  16. 1

    Differentiating between shear and longitudinal acoustic waves in a solid

    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...
  17. R

    High frequency acoustic waves underwater

    Hi, was just wondering if anyone could help me out with this query, I'm just curious to know why high frequency acoustic waves are greatly absorbed underwater? Thanks in advance.
  18. L

    Modeling the Collision of Acoustic Waves

    Hello all, Ive never really worked with Acoustics before but have been looking into acoustic raditation, effects in cavitation, acoustic fields, sonar, etc. However, it has been pretty difficult to find any information on equations or modeling of the collision of the acoustic waves. The...
  19. J

    Detection of longitudinal and shear acoustic waves in solids

    I want to be able to differentiate between longitudinal(P) and Shear(S) waves in solids. Using one Acoustic emission (AE) senor placed 2 to 20 cm form a AE source e.g. a stress induced crack or pencil lead test, how can one detect both the P and S waves and determine what part of the receive...