Noise traveling through space?

[SagaLore]

Originally posted by: Ctrackstar126
doesn't a radio use sound waves? Yea I thought so what country you grow up in?

No it doesn't.

It uses electromagnetic waves.

Sounds waves it caused by the cascading effect of vibrating air. There is no air in space or any vacuum. However, electromagnetic waves don't need some kind of matter to travel in.

Here is an example - watch the waves of the ocean. You're standing on the shore. When the waves from the ocean reach the shore, do they A. cause the shore...land to also make waves? or B. bounce back into the ocean? The land is essentially the vacuum of space. The ocean is the air that sound travels in.

 

[SagaLore]

Originally posted by: myusername
Well look .. the answer is obvious and easily demonstrable by a bell jar and an alarm clock .. but I want to know -

Isn't sound energy? Where does the energy go? The wall of the vessel is not absorbing it - it simply ceases to be

It is kinetic energy. The wall of the vessel continues to reflect until the friction of moving air particles slowly converts the kinetic energy into heat.

 

[myusername]

Originally posted by: ironwing
If you want to learn about the different types of sound waves take a gander:

Here

The site concerns seismic waves but every wave type described can occur in the air and/or solids around you. Incidently the song Radar Love is incorrect, Love waves can not occur in the air but only on surfaces.

If a P wave doesn't have a wavelength or an amplitude, why is it a wave?

 

[dighn]

Originally posted by: hjo3
Well, waves on water are logitudinal

hmmm yeah you are probably right, it just looks transverse... oh well I guess a thin membrane would have been a better example

 

[myusername]

Originally posted by: SagaLore

Originally posted by: myusername
Well look .. the answer is obvious and easily demonstrable by a bell jar and an alarm clock .. but I want to know -

Isn't sound energy? Where does the energy go? The wall of the vessel is not absorbing it - it simply ceases to be

It is kinetic energy. The wall of the vessel continues to reflect until the friction of moving air particles slowly converts the kinetic energy into heat.

So placing a vacuum behind glass has the same effect on sound as putting mercury behind glass has on light?

 

[hjo3]

Originally posted by: myusername

Originally posted by: ironwing
If you want to learn about the different types of sound waves take a gander:

Here

The site concerns seismic waves but every wave type described can occur in the air and/or solids around you. Incidently the song Radar Love is incorrect, Love waves can not occur in the air but only on surfaces.

If a P wave doesn't have a wavelength or an amplitude, why is it a wave?

It has both. The wavelength is the distance between compressions, amplitude is the force of the compressions.

 

[IronWing]

Incidently tsunamis are P waves traveling at the speed of sound in water.

 

[jordanz]

Originally posted by: hjo3

Originally posted by: jordanz
I really like this idea. I feel as though my little vacuum room is possibly. All I'm thinking is I have two rooms (encased in a housing structure of some sort), one inside another, but the outside one is only maybe 3-4ft thick. This outside room is propped on stilts, in which the inside room is the same way just propped up on the inner-walls of the outside room.

Now I just need to know how to make a vacuum, and when I buy a house, I can hide in this room forever. No one will find me. My evil plans are coming together.

But then the inner room will have contact with the outer room and it won't be soundproofed. To do it right, you'd need to build them in zero gee or rig up something with very powerful electromagnets.

Oh damn, you're right. Ain't that a B...

 

[YOyoYOhowsDAjello]

This thread is great :thumbsup:

 

[mercanucaribe]

Originally posted by: dighn

Originally posted by: hjo3
Well, waves on water are logitudinal

hmmm yeah you are probably right, it just looks transverse... oh well I guess a thin membrane would have been a better example

Water waves are transverse, because you can't compress water (much). The water moves in circles like a wheel. That's why an object floating on water waves doesn't move straight up and down, but back and forth.

 

[spidey07]

Originally posted by: sonz70
Or maybe there is


http://www.astronomycafe.net/qadir/ask/a11650.html

Is there really sound in space?

Actually...yes!!

What is sound? It is a pressure wave. So long as you have some kind of gaseous medium, you will have the possibility of forming pressure waves in it by 'shocking' it in some way.

In space, the interplanetary medium is a very dilute gas at a density of about 10 atoms per cubic centimeter, and the speed of sound in this medium is about 300 kilometers/sec. Typical disturbances due to solar storms and 'magneto-sonic turbulence' at the earth's magnetopause have scales of hundreds of kilometers, so the acoustic wavelengths are enormous. Human ears would never hear them, but we can technologically detect these pressure changes and play them back for our ears to hear by electronically compressing them.

Star-farts are NOT sound, mmm'kay?

 

[LongCoolMother]

Originally posted by: dighn

Originally posted by: hjo3
Well, waves on water are logitudinal

hmmm yeah you are probably right, it just looks transverse... oh well I guess a thin membrane would have been a better example

in physics AP, they used water waves as an example for transverse waves. then another textbook said it was neither purely transverse or longitudinal.

 

[IronWing]

Originally posted by: LongCoolMother

Originally posted by: dighn

Originally posted by: hjo3
Well, waves on water are logitudinal

hmmm yeah you are probably right, it just looks transverse... oh well I guess a thin membrane would have been a better example

in physics AP, they used water waves as an example for transverse waves. then another textbook said it was neither purely transverse or longitudinal.

There are different kinds of waves that can travel in water. Check the link I posted above.

 

[SVT Cobra]

Originally posted by: Mo0o
They emit pressure waves but without a medium to compress, no sound is made. But if you put a receiver you can interpret teh pressure waves as sound again. I think that's how it works.

:thumbsup:

 

[Howard]

Originally posted by: hjo3

Originally posted by: dighn

Originally posted by: hjo3
Sound waves are longitudinal, electromagnetic waves are transverse. You need some kind of matter to send longitudinal waves through (solid, gas, liquid). Transverse waves don't require matter to move through.

transverse waves don't require matter to propagate? what about wave on a string? surface of water? I think light is just a special case, it's not its "transverseness" that allows it to travel in vacuum.

Well, waves on water are logitudinal, but you have a point with the string. Let me amend that to: transverse waves require either a solid medium or no medium.

How about electromagnetic waves don't need a medium to propogate while non-EM waves do?

 

[hjo3]

Originally posted by: LongCoolMother

Originally posted by: dighn

Originally posted by: hjo3
Well, waves on water are logitudinal

hmmm yeah you are probably right, it just looks transverse... oh well I guess a thin membrane would have been a better example

in physics AP, they used water waves as an example for transverse waves. then another textbook said it was neither purely transverse or longitudinal.

Ehh... transverse waves can't propagate in gas or liquid.

 

[Iron Woode]

In space, no one can hear you scream.

someone had to say it.

 

[klah]

This thread would make DrPizza cry. Let's hope he does not have the misfortune of reading it.