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This is an old revision of this page, as edited by Loomhigh223555 (talk | contribs) at 09:02, 17 February 2016 (→what affects sound properties.: new section). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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Edit request on 5 January 2012

First paragraph refers to "compressible media" water is not compressible...see hydrostatic testing. Suggest removing word compressible, sound does move through mediums, space is a vacuum and is the absence of a media, therefore sound does not propagate through space.

65.175.162.111 (talk) 23:29, 5 January 2012 (UTC)[reply]

Sound moves through water by compression waves, the same way it moves through air and to some extend through solids. And "media" is the plural of "medium"; yes, sound needs a medium, and won't propagate through a vacuum. Dicklyon (talk) 23:36, 5 January 2012 (UTC)[reply]
Not done: please establish a consensus for this alteration before using the {{edit semi-protected}} template. Mato (talk) 17:21, 11 January 2012 (UTC)[reply]

There is no such thing as sound waves. Lets imagine in the best Einstein tradition that a tree falls in a forest, 45 tons of Redwood crash to the ground. In doing so it will disturb the air around it and setup frequencies of disturbed air - which will travel out multi directionally. There is no noise. On reaching our ear (or the ear of any mammal for that matter) the disturbances of air travel down our ear cavity and strike our eardrum, or tympanic membrane (probobly the most complex peice of tissue in our body). These vibrations are amplified by 3 small bones; one end of the first bone being connected from the innner ear side of the membrane - to the mebrane, and the end of the third bone to an 'elasticky' plug at the opening of the cochlea. The cochlea is filled with a viscous substance a bit like olive oil and the amplified vibrations from the 3 bones couse the viscous substance to vibrate at various frequencies which are picked up by hairlike receptors connected to the the brain which converts these vibration into what we know as sound. — Preceding unsigned comment added by 2.96.115.141 (talk) 09:12, 25 February 2012 (UTC)[reply]

Speed of Sound

The speed of sound at sea level is also expressible as 1125.3281 feet/sec, as many use it. Audio engineers and recording people are still comfortable working in feet/sec, and that number should be included paranthetically in the sectoin of the same name in this article. 99.2.69.235 (talk) 09:05, 28 February 2012 (UTC)[reply]

Sound Can Travel Through Vacuum?

I know it's what we all learned in High School, but apparently new research has proven otherwise. Maybe it's just quackery? Someone more expert on these matters ought to take a look. 67.41.68.211 (talk) 09:18, 15 March 2012 (UTC)[reply]

The article does not say that sound can travel through a vacuum. Instead, it says that if you have a piezo-electric material and sound waves hit it, the sound waves can mechanically excite the material, which then creates electromagnetic waves. It is those waves that then cross the vacuum gap. --MichiHenning (talk) 22:37, 10 May 2012 (UTC)[reply]
Crude radio. Binksternet (talk) 02:36, 11 May 2012 (UTC)[reply]

Edit request on 10 May 2012

Sound intensity link should point to Sound intensity rather than Intensity (physics), since there is a specific page for that. Gozzilli (talk) 09:26, 10 May 2012 (UTC)[reply]

Seems reasonable, Done. Monty845 05:07, 14 May 2012 (UTC)[reply]

Over-linking

This article appears to be extensively over-linked (WP:OVERLINK. There are many links (such as pressure, density, species, mammals, etc.) Any links that do not directly relate to the topic or reference commonly understood terms should be removed. --MichiHenning (talk) 22:36, 10 May 2012 (UTC)[reply]

Grammar Edit

The line "Other species have a different range of hearing" needs to become "Other species have different ranges of hearing" because the various species have different respective ranges of hearing and not just one single range. This is just a simple edit that I thought someone should change. — Preceding unsigned comment added by 174.49.11.210 (talk) 00:46, 25 May 2012‎ (UTC)[reply]

If a tree falls in the forest and no one is around to hear it does it make a sound?

If a tree falls in the forest and no one is around to hear it does it make a sound? — Malikis2cool (talk) 02:38, 28 March 2013 (UTC)[reply]

If a man speaks and there is no woman to hear him, is he still wrong?
MichiHenning (talk) 21:57, 2 June 2013 (UTC)[reply]


These are good questions, in earnest, and they illustrate that the concept of sound is not just a concept of mechanical disturbances propagated in matter, but is directly connected with the perception or sensation of these disturbances in the ear. Already by 1900 this duality of the definition of sound was recognized and should be represented in the article. Kbrose (talk) 21:28, 12 June 2013 (UTC)[reply]
The definition in this article does not require a human to hear it, only that it has frequencies that a human could hear.
How do you know that a tree has fallen in a forest? QuentinUK (talk) 01:46, 21 January 2014 (UTC)[reply]

"Human Ear"

Predicted response of most readers: "No s*** Sherlock". CubOfJudahsLion (talk) 20:22, 16 July 2013 (UTC)[reply]

Lost information on sound looking for a home

The below information was included in the Music Therapy page, but did not belong there. Maybe some of this would be useful to include in the Sound article?


Sound Phenomenon

The phenomenon we call sound is the propagation of wave-like mechanical vibrations or pulsations traveling through a medium such as air, water or metal.[1] The periodicity of the vibration is typically known as the frequency and is the measure of the pulsations per a specific unit. A common measure is pulsations per second which is expressed as hertz (Hz).[1] The term “sonic” is used as an adjective denoting a characteristic of sound and is technically a branch of acoustics. The typical human experience of sound is generated within a hearing range limited to a low of 20 Hz and high of 20,000 Hz.[2] The experience of the sound frequency may be referred to as the pitch of the sound. Lastly, a sound may be produced at a single pitch or be the simultaneous combination of multiple frequencies and as such, in music, would be referred to as chord.

Harmonics and Sound

In sound, we also have the phenomenon of harmonics which is based on the frequency of the vibration. Specific multiples of the initial frequency create new pitches that are in the same periodicity as the initial frequency.[3] Thusly, an original sound can be modified harmonically with adjustments either up or down the initial frequency while staying true to its periodicity. This process may include the harmonious adjustment of frequencies normally outside of the human hearing range to become sounds within the 20 Hz to 20,000 Hz range and therefore an inaudible signal now becomes an audible sound.

Sound As A Constant Vibration

All particles, atoms and molecules are in constant vibratory motion and release elastic waves that in turn move their innate medium (such as water or air) as well as perturb the space around them.[4] Consequently all matter down to the most miniscule in size produces “sound” although this sound is normally outside of the human range of hearing. The “sound” produced by any particular substance will consequently have a highly specific set of pitches and chords that are both the identity and expression of that substance.[4] With harmonic adjustments, this set of frequencies can be produced within the range of human hearing. This set of signals is known as the Sonic Signature of the substance.

Sound As A Vibration

From a physical point of view, a substance that vibrates at the same frequency as another becomes a copy of it, even if it remains chemically different. In water each molecule typically vibrates on its own, independently. But if a substance is dissolved in the water or a frequency source is applied to the water, the vibrations of the water molecules can shift to be in resonance with the substance vibrations or the source frequency of a stimulating signal.[4] Given that the human body is composed mostly of water, the possibility of generating effects within the body using Sonic Signatures becomes provocative. As an example, one scientific researcher (Cyril W. Smith, PhD) played recorded and amplified sound derived from the thyroxin molecule over speakers to the conference audience and had to stop because members of the audience began to experience tachycardia which is a symptom of an excess of this particular thyroid hormone.[5]

Sonic Signatures

Sonic Signatures can originate from sources other than the innate vibration of substances. The most recognizable collection of Sonic Signatures is the expression we call music. Music Therapy is a widely recognized modern healing agent with a deep social and cultural history.[6][7][8] Sound vibration healing is also well known in yogic tradition with the use of “seed syllable mantras” (bija) and in Chinese Qi Gong (qi gong) where specific vocal sounds are used to stimulate specific organ systems in the body.,[9][10][11][12]

  1. ^ a b Asimov, Isaac (1966). Understanding Physics: Motion, Sound, Heat. The New American Library. ISBN 978-0451626622.
  2. ^ Rossing, Thomas (2011). Springer Handbook of Acoustics. Springer. ISBN 978-0-387-30425-0.
  3. ^ Klapuri, Davy, Anssi, Manuel (2008). Signal processing methods for music transcription. Springer. ISBN 978-0-387-30667-4.{{cite book}}: CS1 maint: multiple names: authors list (link)
  4. ^ a b c Citro, Massimo (July 6, 2011). The Basic Code of the Universe – The Science of the Invisible in Physics, Medicine and Spirituality. Toronto, Canada: Park Street Press. ISBN 978-1594773914.
  5. ^ Cyril, Smith (1999). "Hidden properties of Water". The Polyclinic Medical and Surgical Department.
  6. ^ Mattson, Jill (Feb 2010). Ancient Sounds – Modern Healing. ISBN 978-0982281406.
  7. ^ Davis, Doreen (2004/2013). Sound Bodies through Sound Therapy. ISBN 978-0-9622326-5-7. {{cite book}}: Check date values in: |date= (help)
  8. ^ Mattson, Jill (2011). Secret Sounds – Ultimate Healing. ISBN 9780982281437.
  9. ^ Rajmani, Tigunait, Pandit (1996). The Power of Mantra & The Mystery of Initiation. Pennsylvannia: Himalayan Press. ISBN 0-89389-176-2.{{cite book}}: CS1 maint: multiple names: authors list (link)
  10. ^ Thomas, Ashley-Farrand (1999). Healing Mantras; Using Sound Affirmations for Personal Power, Creativity and Healing. New York: Ballantine Wellspring. ISBN 0-345-43170-7.
  11. ^ Johnson, Jerry Allen (2002). "Chinese Medical Qi Gong Therapy". 1-885246-29-3 (International Institute of Medical Qigong).
  12. ^ Chia, Chia, Mantaak, Maneewan (1989). Fusion of the Five Elements 1: Basic and Advanced Meditations for Transforming Negative Emotions. New York: Healing Tao Books. ISBN 0-935621-18-0.{{cite book}}: CS1 maint: multiple names: authors list (link)

Njbetz (talk) 18:25, 12 December 2014 (UTC)[reply]

Page Protection?

This page seems to be a hub for vandalism; if you look in the page history you'll see that almost all of the recent edits are vandalism and their reversions. Maybe we should make it so that only registered users can edit this page? -Sonicwave talk 05:47, 20 February 2015 (UTC)[reply]

what affects sound properties.

while i was doing my school project, i found it quite difficult to find the out how amplitude, frequency etc affected sound waves, i would appreciate it if somebody could add that information in around properties of sound, as there only seems to be a list of what affects sound rather than a discription of how. thanks. Yours indubitably. (talk) 09:02, 17 February 2016 (UTC)[reply]

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