Why sound needs a medium to travel and light not?

Both are waves then who do Sound waves need a medium to travel while
Light & EM do not need any medium to travel?

And why Sound travels so slow I heard just 343 m / sec

Is Sound speed a constant too?

Can we increase the speed of Sound wave to 300,000 km/Sec. Incase we
do that will it convert into light?

Bye
Sanny

Dear Sanny:

On May 19, 8:56 am, Sanny hotmail.com> wrote:

Different kinds of momentum transfer.

Both are partricle-motion based too. The choice of model simply
describes the math involved, and how much answer you get per "CPU
cycle".

In my worldview, the Universe is its medium.

Different media, different speeds. Water is much higher (~1500 m/
sec), steel is higher yet (~5000 m/sec).

In sci.physics Sanny hotmail.com> wrote:

Because sound is vibrations in a medium.



Sound:

http://en.wikipedia.org/wiki/Sound

Light:

http://en.wikipedia.org/wiki/Light

On May 19, 8:56 am, Sanny hotmail.com> wrote:

Prior to the 20th century many physicists said that EM waves (light)
needed a medium too---the "luminiferous ether". Now, as far as we
know, there is no luminiferous ether and light needs NO medium. As to
why sound needs a medium: well, that is just the definition of sound!

Look at the equations that lead up to the wave equation for sound. The
speed of sound is a combination of various parameters involving the
carrying medium. Look at it another way: sound is a pressure wave. The
changes in pressure are conveyed to neighbouring regions by the actual
motion of molecules, so the speed of sound is governed, at least in
part, by the speeds of molecules as they giggle around in the air (or
water, or steel, or earth, or whatever).

On May 19, 11:56 am, Sanny hotmail.com> wrote:

Sound needs a medium because it is a real wave and it needs the medium
to transfer momentum. Light is not the same kind of wave. Some people
call it a wavicle (or did when I was in school). It does not need a
medium because it is made of photons, physical objects having mass
which can travel through a vacuum.

There is no why, that just happens to be its speed in air.

It is in air of a given temperature and pressure. It travels much
faster through water or the ground.

No we can't.

"Sanny" hotmail.com> wrote in message
news:530768f6-eba8-4a2a-a210-34b0c2a0057a@p25g2000pri.googlegroups.com...

You need to figure out how the propagate. They are very different types of
wave. Does a wave on the sea need a medium to travel in?

No. The speed of sound depends on the medium that the sound is travelling
through. It's much faster in steel or water than it is in air.

No. .. but some people have speculated that in the early universe sound may
have travelled faster than light.

no.

Sanny wrote:

[snip spammed crap]

Why kites need a medium to travel and bullets not?

Good Analogy !!!

Because Kites uses Aerodynamics to fly in air. It uses Air Lift to
rise high. Bullets travel using the Kinetic Energy possesed by it.

Does Light has a Kinetic Energy that make it fly without the need of
any Medium?

Bye
Sanny

ElectroMagnetic radiation and sound waves are two different things.
Some aspects of a photon are merely statistical ( semi-random ), while
other aspects can be modeled as an endless 4-D ElectroMagnetic field.

Gravity is also an ( imponderable ) 4-D field; but, without it,
there'd be no length, no time, no pressure, no nothing.

On May 19, 11:56 am, Sanny hotmail.com> wrote:

Probaby because you misunderstand light.

Light does require a medium.

<< Unlike the vacuum of classical physics, today's physical vacuum
corresponds to what is called the vacuum state or the quantum vacuum,
which is "by no means a simple empty space".[17][18] Thus, free space
is not a synonym for the physical vacuum. >>
http://en.wikipedia.org/wiki/Vacuum_permittivity

http://en.wikipedia.org/wiki/Free_space
http://www-ssg.sr.unh.edu/ism/what.html
http://nobelprize.org/physics/articles/ekspong/index.html

Sound relies on loose molecular couples.
Light relies on tight Coulomb couples.