Speed of Sound - Revision history

Nbhatnagar7 at 20:41, 5 December 2015

2015-12-05T20:41:53Z

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	===Further reading===		===Further reading===

	[~~https~~://www.~~grc~~.~~nasa~~.~~gov~~/www/~~k-12~~/~~airplane~~/~~sound~~.~~html NASA~~]		[http://www.physicsbook.gatech.edu/Doppler_Effect Doppler Effect]

			[http://www.physicsbook.gatech.edu/Nature,_Behavior,_and_Properties_of_Sound Nature, Behavior, and Properties of Sound]

			[http://www.physicsbook.gatech.edu/Resonance Resonance]

	[http://~~hyperphysics~~.~~phy-astr~~.~~gsu~~.edu/~~hbase/sound/souspe.html Speed of~~ Sound ~~in Air Calculator~~]		[http://www.physicsbook.gatech.edu/Sound_Barrier Sound Barrier]

	[http://~~hyperphysics~~.~~phy-astr~~.~~gsu~~.edu/~~hbase/sound/soucon.html All about~~ Sound]		[http://www.physicsbook.gatech.edu/Speed_of_Sound_in_Solids Speed of Sound in Solids]

	===External links===		===External links===

			[https://www.grc.nasa.gov/www/k-12/airplane/sound.html NASA]

			[http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html Speed of Sound in Air Calculator]

			[http://hyperphysics.phy-astr.gsu.edu/hbase/sound/soucon.html All about Sound]

	==References==		==References==

Nbhatnagar7 at 20:39, 5 December 2015

2015-12-05T20:39:35Z

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	===Further reading===		===Further reading===

	~~Books, Articles or other print media on this topic~~		[https://www.grc.nasa.gov/www/k-12/airplane/sound.html NASA]

			[http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html Speed of Sound in Air Calculator]

			[http://hyperphysics.phy-astr.gsu.edu/hbase/sound/soucon.html All about Sound]

	===External links===		===External links===
	~~[http://www.scientificamerican.com/article/bring-science-home-reaction-time/]~~


	==References==		==References==

	~~This section contains the the references you used while writing this page~~		[https://en.wikipedia.org/wiki/Speed_of_sound#History Speed of Sound]

			[http://www.physicsbook.gatech.edu/Speed_of_Sound_in_a_Solid Speed of Sound in Solids]

			[http://www.acs.psu.edu/drussell/Demos/Dispersion/dispersion.html Dispersion of waves]

			[http://www.thermaxxjackets.com/newton-laplace-equation-sound-velocity/ History of the Speed of Sound]

			Matter and Interactions

	[[Category:Which Category did you place this in?]]		[[Category:Which Category did you place this in?]]

Nbhatnagar7 at 20:33, 5 December 2015

2015-12-05T20:33:34Z

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	==History==		==History==

	~~Put this idea~~ in ~~historical context~~. ~~Give~~ the ~~reader~~ the ~~Who~~, ~~What~~, ~~When, Where~~, and ~~Why~~.		The first person to calculate the speed of sound was Sir Issac Newton in the latter half of the 17th century. Newton used only pressure and density in his original equation of the speed of sound. Later, but in the same century, Pierre-Simon Laplace added gamma, or a measure of pressure, to Newton's formula. Laplace set K<sub>s</sub> to γ * pressure. This is called the Newton-Laplace formula and is still used today to determine the speed of sound in different materials.

	== See also ==		== See also ==
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	This section contains the the references you used while writing this page		This section contains the the references you used while writing this page



	[[Category:Which Category did you place this in?]]		[[Category:Which Category did you place this in?]]

Nbhatnagar7 at 20:25, 5 December 2015

2015-12-05T20:25:37Z

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	''c'' = 1507.996 m/s		''c'' = 1507.996 m/s

			We then use the equation:

			x/c = t

			to determine how long it would take for the sound to travel. Let's list what we know.

			<ul style="list-style-type:circle">
			<li>''c'' is the speed of sound</li>
			<li>''x'' is distance or 1000 m</li>
			<li>''t'' is time</li>
			</ul>

			''t'' = 1000/1507.996 m/s

			''t'' = .66313 seconds

	==Connectedness==		==Connectedness==

Nbhatnagar7 at 20:21, 5 December 2015

2015-12-05T20:21:45Z

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	===Difficult===		===Difficult===

			How long does it take for someone at a depth of 1000 meters in the ocean to hear someone at the surface?

			First, we know that we use the liquids version of the Newton-Laplace equation. This means we replace stiffness with the bulk modulus of the fluid. We can then list what we know:

			<ul style="list-style-type:circle">
			<li>''c'' is the speed of sound</li>
			<li>''K'' is 2.34e9 Pa</li>
			<li>''ρ'' is 1029 kg/m<sup>3</sup></li>
			</ul>

			Therefore:

			''c'' = √(2.34e9 &frasl; 1029)

			''c'' = 1507.996 m/s

	==Connectedness==		==Connectedness==

Nbhatnagar7 at 20:15, 5 December 2015

2015-12-05T20:15:15Z

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	First, we know that we use the gases version of the Newton-Laplace equation. This means we replace stiffness with γ and pressure. We can then list what we know:		First, we know that we use the gases version of the Newton-Laplace equation. This means we replace stiffness with γ and pressure. We can then list what we know:

			<ul style="list-style-type:circle">
			<li>''c'' is the speed of sound</li>
			<li>''γ'' is 1.28 </li>
			<li>''p'' is 90 atmospheres, or 9.119e6 Pa</li>
			<li>''ρ'' is 1.1842 kg/m<sup>3</sup></li>
			</ul>

			Therefore:

			''c'' = √(1.28 (9.119e6 &frasl; 1.1842)

			''c'' = 2517.293 m/s

	===Difficult===		===Difficult===

Nbhatnagar7 at 20:11, 5 December 2015

2015-12-05T20:11:55Z

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	===Middling===		===Middling===

	~~How long does it take for you to hear someone calling for you if you both are~~ on Venus and ~~are 20 meters apart?~~		What is the speed of sound on Venus? Assume the atmosphere of Venus is 100% Carbon Dioxide.

			First, we know that we use the gases version of the Newton-Laplace equation. This means we replace stiffness with γ and pressure. We can then list what we know:

	===Difficult===		===Difficult===

Nbhatnagar7 at 20:04, 5 December 2015

2015-12-05T20:04:07Z

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	Therefore:		Therefore:

	''c'' = √(1.17e11 &frasl 8960)		''c'' = √(1.17e11 &frasl; 8960)

	''c'' = 3613.59 m/s		''c'' = 3613.59 m/s

	===Middling===		===Middling===

			How long does it take for you to hear someone calling for you if you both are on Venus and are 20 meters apart?

	===Difficult===		===Difficult===

Nbhatnagar7 at 20:01, 5 December 2015

2015-12-05T20:01:37Z

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	====Solids====		====Solids====

	In solid objects, the speed of sound depends on the Young's Modulus and the density of the solid is known. Young's modulus is dependent on the stress and strain of the solid.		In solid objects, the speed of sound depends on the Young's Modulus and the density of the solid is known. Young's modulus is dependent on the stress and strain of the solid. Young's modulus replaces ''K<sub>s</sub>'' in the Newton-Laplace equation.

	[[File:solids.png]]		[[File:solids.png]]
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	===Simple===		===Simple===

			What is the speed of sound in copper?

			First, we know that we use the solids version of the Newton-Laplace equation. This means we replace stiffness with Young's Modulus. We can then list what we know:

			<ul style="list-style-type:circle">
			<li>''c'' is the speed of sound</li>
			<li>''Young's Modulus'' is 117 GPa</li>
			<li>''ρ'' is 8960 kg/m<sup>3</sup></li>
			</ul>

			Therefore:

			''c'' = √(1.17e11 &frasl 8960)

			''c'' = 3613.59 m/s

	===Middling===		===Middling===

Nbhatnagar7 at 19:12, 5 December 2015

2015-12-05T19:12:27Z

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	==Examples==		==Examples==

	~~Be sure to show all steps in your solution and include diagrams whenever possible~~		===Simple===



	~~===Simple===~~
	===Middling===		===Middling===
	===Difficult===		===Difficult===

	==Connectedness==		==Connectedness==
	~~#How~~ is this ~~topic connected~~ to ~~something~~ that ~~you~~ are ~~interested~~ in?
	~~#How is it connected~~ to ~~your major?~~		The speed of sound is interesting because it isn't a constant, like light. Sound is also an observable phenomena which is why we were able to first determine the differences in the speed of sound between air and water. I used to stay underwater in a pool and listen to people above the water because it sounded cool. I also think it is interesting to observe the effect that different mediums have on sound- since sound is a wave, it is only observable by the effect it has on the surroundings.
	~~#Is there~~ an ~~interesting industrial application?~~
			As a Chemical Engineering major, I don't plan to do much work with sound, but I find the effects of changing the medium of sound interesting. The chemical composition of different solids or liquids can have an effect on their interactions with the outside world, which is something that a Chemical Engineer has to remain aware of when working with any products that may be industrialized.

			If sound travels faster in certain solids, this information can be used to develop certain types of plastics or other cheap building materials that are also soundproof. On the other side of this, in terms of military development, soldiers or police may be in situations where they need to sharpen their hearing, so the development of an earpiece or headphones that can collect sound waves from solids rather than the air could be a breakthrough in recon assignments.

	==History==		==History==