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

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Discussion Overview

The discussion revolves around the interaction of sound waves when two radios are positioned facing each other, particularly focusing on the effects of sound wave superposition, interference, and diffraction. Participants explore how these phenomena might influence the perceived loudness and directionality of sound when radios play the same or different songs.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether sound waves from two radios playing different songs would combine to become louder if they match, expressing uncertainty about the nature of sound wave interactions.
  • Another participant references the superposition principle, suggesting that sound waves can combine, but does not clarify how this applies to the scenario.
  • A participant notes that when two radios play the same song, the sound can produce interference patterns, leading to maxima and minima in sound intensity, rather than simply doubling the perceived loudness.
  • It is proposed that while the sound power may increase, the actual perception of loudness may not be straightforward due to interference effects.
  • One participant raises the idea that sound waves might bounce off the other speaker, questioning whether this would lead to a similar volume perception as using just one speaker, and whether this effect would vary based on listener position.
  • Another participant confirms that diffraction occurs at obstacles, such as radios, but suggests that the effect would be minimal due to the small size of the radios, indicating that the presence of a second radio may not significantly alter sound perception.

Areas of Agreement / Disagreement

Participants express differing views on how sound waves interact in this scenario, particularly regarding the effects of interference and diffraction. There is no consensus on the exact nature of these interactions or their impact on perceived loudness.

Contextual Notes

Participants do not fully resolve the complexities of sound wave interactions, including the assumptions about listener position and the specific conditions under which sound waves combine or interfere.

doglover9754
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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 and become louder? Or is it just my hearing? How about this, if you put two radios facing each other and playing the same song. It will just become louder right? But the radio in front of the other radio is blocking the sound waves from traveling on its usual course. So wouldn’t that mean that you would hear the song at the same volume like using one radio? I’m not sure if this makes sense to you or not so I’m sorry if it doesn’t. Also, for those of you who have read my other analytical questions, I’m sorry if it seems like I’m just bugging you and I’m just overthinking it.
 
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doglover9754 said:
How about this, if you put two radios facing each other and playing the same song. It will just become louder right?
That's very oversimplified. Two loudspeakers playing exactly the same tone can produce maxima and minima (or even nulls) in various directions due to wave interference. When the sound played is a complicated, real sound like speech or music, the interference maxes and mins are in different directions for the different frequencies so you will not find a null or a maximum in any particular direction. "Twice as loud" is all you will notice because twice the sound power will reach your ears.
Any normal sized radio will not produce a noticeable 'shadow' behind it so that the sound would be pretty much twice as loud, even behind one of them.
 
sophiecentaur said:
"Twice as loud" is all you will notice because twice the sound power will reach your ears.
Any normal sized radio will not produce a noticeable 'shadow' behind it so that the sound would be pretty much twice as loud, even behind one of them.
But then won’t the sound waves bounce off the other speaker and kinda like turn to a different place (diffraction I think that’s what it’s called). So wouldn’t you hear the same volume with the 2 speakers facing each other and just one speaker? Or would it change depending on where you stand?
 
doglover9754 said:
like turn to a different place (diffraction
Yes. Diffraction will always occur at an obstacle. It's just that the obstacle, a radio, is small and its diffraction pattern would be very low level and of no identifiable form. I would actually defy you to tell any difference with second radio there or radio not there (turned off, of course). There are so many other paths for the sound to get from radio to ear.
 
sophiecentaur said:
Yes. Diffraction will always occur at an obstacle. It's just that the obstacle, a radio, is small and its diffraction pattern would be very low level and of no identifiable form. I would actually defy you to tell any difference with second radio there or radio not there (turned off, of course). There are so many other paths for the sound to get from radio to ear.
Ahhhh. That makes sense! Thanks!
 

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