Discover the Science of Sound Wave Cancellation | From Physics Forums

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Discussion Overview

The discussion revolves around the concept of sound wave cancellation, particularly focusing on the conditions under which sound waves might cancel each other out. Participants explore theoretical and practical aspects of wave interference, energy transfer, and the implications of sound wave behavior in various contexts.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants assert that true cancellation of sound waves is not achievable in reality, as identical waves will create standing waves rather than disappearing entirely.
  • Others propose that in mathematical terms, equal and opposite waves can cancel each other out, but question how this translates to real-world scenarios.
  • A participant raises the question of where the energy in sound waves goes if they cancel out.
  • There are claims that while mathematical models suggest cancellation, the actual physical behavior of sound waves involves complexities that may prevent perfect cancellation.
  • Some argue that sound waves transport net positive energy and cannot simply cancel out, challenging the notion of complete cancellation.
  • Participants discuss the relevance of quantum physics to the topic, with mixed opinions on its applicability to macroscopic sound wave behavior.
  • There is a playful exchange regarding the rules of engagement in the discussion, indicating a more informal tone at times.

Areas of Agreement / Disagreement

Participants express multiple competing views on the feasibility of sound wave cancellation, with no consensus reached on the matter. The discussion remains unresolved, with differing interpretations of mathematical and physical principles.

Contextual Notes

Some statements reflect assumptions about ideal conditions for wave cancellation, while others highlight the complexities of real-world sound wave interactions. The discussion also touches on the distinction between theoretical models and practical observations.

sid_galt
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https://www.physicsforums.com/showthread.php?p=787788#post787788"

Lapin Dormant said:
Interference isn't the goal, cancellation is, then there is no more noise, but, as it is stated above, it would be diffcult, at best, I already knew that, so now, this thread seems to be getting 'hi-jacked' to this topic, so, as to discourage that, I will cease, now.
Thanks

Lapin Dormant said:
If you would like to start a new thread, the waves need be equal and Opposite each other, in waveform.


When two waves cross each other's path, even if they are identical, they won't just disappear. They'll set up standing waves where they are interfering provided they are identical. Beyond that they will continue on their path. There will be no sound wave cancellation.
 
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That A pressure wave will not cancel, in absolutia I would agree, except in mathematics where 'absolutia' is found, in reality? NOT absolutely, But Mostly.
 
Where does the energy in the sound waves go?
 
Cancels out, In Math its' a Minus one, meeting a Positive one, and the result is Zero, in Reality 0.99999∞+1 ≡ 0.99999∞-1 as Individual Event histories, hence There is a Resultant of One, just how large that one is, is another story altogether.

But, that is Reality.

If a Negative trough meets it's opposite and equal Peak they will (should) cancel out, How 'perfectly-well' that can be done, in reality is 'fun' for some folks.
 
Lapin Dormant said:
Cancels out, In Math its' a Minus one, meeting a Positive one, and the result is Zero, in Reality 0.99999∞+1 ≡ 0.99999∞-1 as Individual Event histories, hence There is a Resultant of One, just how large that one is, is another story altogether.
But, that is Reality.

You're joking right?

Two individual sound waves transport a net positive energy. Their energies can't just cancel out.
 
They are waveforms, they have shape, they can be equated as 'equal and opposite' in 'shape and form' as to cancel.

The reality one is simply quantum physics, how finely it needs be cut as to ensure that everything remains idiosyncratic, and asynchronus, both are Math, so Both show Ideals.

IN Physical reality I have watched it on television, it works, Almost totally.

Is this going to continue on, forever?
 
Lapin Dormant said:
They are waveforms, they have shape, they can be equated as 'equal and opposite' in 'shape and form' as to cancel.

They will not cancel. Try imagining two waves of equal amplitude and frequency with a phase difference of 180 degrees. They will create standing waves where they intersect. At other points, they will simply continue along their path.

What you are suggesting would violate the first law of thermodynamics.

Lapin Dormant said:
The reality one is simply quantum physics, how finely it needs be cut as to ensure that everything remains idiosyncratic, and asynchronus, both are Math, so Both show Ideals.
Quantum Physics has nothing to do with sound waves, atleast not on macroscopic levels.

IN Physical reality I have watched it on television, it works, Almost totally.

TV =/= reality.

Is this going to continue on, forever?

If you want to quit, say so. I like to have the last word though. :smile:
 
O.K. I'll play your game .. .. ..my rules though.

{Oh yes, they are Pressure waves, Not electrical or EMR right?}

To play this game, first you must "Master the Game" by making a Move, to prove you are a Master, though, you must not make any moves.

LD
G'ee head .. .. .. ..[/color]
 
Lapin Dormant said:
O.K. I'll play your game .. .. ..my rules though.
{Oh yes, they are Pressure waves, Not electrical or EMR right?}
To play this game, first you must "Master the Game" by making a Move, to prove you are a Master, though, you must not make any moves.
LD
G'ee head .. .. .. ..[/color]

I don't accept your rules.

Don't post off-topic comments please
 
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