Sound Power Question: How Much Energy Is Needed?

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Discussion Overview

The discussion revolves around the energy requirements for generating sound at specific decibel levels, particularly comparing natural sound sources like jackhammers and rocket engines to artificially created sound using speakers. The scope includes theoretical considerations of sound power, efficiency, and energy input.

Discussion Character

  • Debate/contested, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant notes that sound power is measured in watts and questions whether the energy input required to artificially create sound at a specific decibel level would equal the sound power output.
  • Another participant asserts that creating sound is not 100% efficient, suggesting that more energy would be needed than the sound power output, using the jackhammer as an example.
  • A different participant raises the scenario of producing sound virtually through computer-generated means and questions whether this method would require less energy than the stated sound power output.
  • In response, another participant emphasizes that speakers also lack 100% efficiency, indicating that to achieve a sound power of a million watts, at least a million watts of input would be necessary.
  • One participant expresses gratitude for the information and seeks clarification on the conditions under which things must be 100% efficient.

Areas of Agreement / Disagreement

Participants express differing views on the efficiency of sound generation and the energy required to produce sound at high decibel levels. There is no consensus on whether artificial sound generation can achieve the same efficiency as natural sources.

Contextual Notes

The discussion includes assumptions about efficiency and the nature of sound production, which remain unresolved. The specific conditions under which efficiency is considered are not fully articulated.

Who May Find This Useful

Individuals interested in acoustics, sound engineering, and the physics of sound generation may find this discussion relevant.

markiemoo
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Hi Guys,

I know that sound power can be measured in watts. For example a Jackhammer is around 120db which would produce a watt of electricity.

My question is, if I wished to artificially create a sound at the same db would you have to put in as much energy?

For example... if a rocket engine at 180db produced a potential of a million watts, if I wanted to artificially create this decibal volume would a million watts of energy have to be put into it to generate it?

Thanks guys!
 
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Yes, and more. You can't create sound with 100% efficiency, so you'll need more. The jackhammer makes heat and breaks rocks while it makes sound so it may require dozens or hundreds of watts to make one watt of sound.
 
What if the sound is produced virtually? computer-generated and put through a speaker big enough to artificially create the sound power of 180db? would that be using more power output?

To my mind, to do it the way I just put it wouldn't need a million watts or more to generate the sound power of 180db.
 
No speakers are 100% efficient, so if you want to make a million watts of sound power, you need at least a million watts of input.
 
Thanks very much for the information guys! very useful :)

on a final note, in which way must things be 100% efficient?
 

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