Light moving through water or glass is slower. As
wavelength * fraquency = speed,
what changes: wavelength, frequency or both ?
Another question: what we observe as the colour of light,
does this correspond to energy, frequency or wavelength ?
And a third: are the physicists able to measure
amplitude, frequency and wavelength of light ?
Hero

On 28 Sep 2005 08:05:36 -0700, wrote:

Light moving through water or glass is slower. As
wavelength * fraquency = speed,
what changes: wavelength, frequency or both ?
Another question: what we observe as the colour of light,
does this correspond to energy, frequency or wavelength ?
And a third: are the physicists able to measure
amplitude, frequency and wavelength of light ?
Hero


Speed and wavelength change, frequency stays the same.

wrote:
Light moving through water or glass is slower. As
wavelength * fraquency = speed,
what changes: wavelength, frequency or both ?
Another question: what we observe as the colour of light,
does this correspond to energy, frequency or wavelength ?
And a third: are the physicists able to measure
amplitude, frequency and wavelength of light ?
Hero


See: http://scienceworld.wolfram.com/physics/Optics.html
http://scienceworld.wolfram.com/physics/Refraction.html
http://scienceworld.wolfram.com/physics/SnellsLaw.html

frequency as energy is dependet on frequency .(energy is not wasted in
refration) our eyes utilise light energy to percieve light hence
colours are also due to frequency.
please clear third question (which instrument)

Divam wrote:
frequency as energy is dependet on frequency .(energy is not wasted in
refration) our eyes utilise light energy to percieve light hence
colours are also due to frequency.
please clear third question (which instrument)


Suggestion
o Quote something of which you are repling to.
o Read what you write before posting it.

What question [in context] do you have for the newsgroup?

On a sunny day (28 Sep 2005 08:05:36 -0700) it happened
wrote in
. com:

Light moving through water or glass is slower. As
wavelength * fraquency = speed,
what changes: wavelength, frequency or both ?
wavelength (color does not change if red trafic light is seen through glass).

Another question: what we observe as the colour of light,
does this correspond to energy, frequency or wavelength ?
all of it
(higher energy photons have higher frequency).

And a third: are the physicists able to measure
amplitude, frequency and wavelength of light ?
yes

Hero

Jan Panteltje wrote:
On a sunny day (28 Sep 2005 08:05:36 -0700) it happened
wrote
....
And a third: are the physicists able to measure
amplitude, frequency and wavelength of light ?
yes
Hi, Charles Sam, Divan and Jan
Thanks ( and bedankt) for Your quick responses.
So may be You are willing to answer some mo
In water-waves there's a lot of energy in amplitude, how about light,
is light amplitude connected to energy ?
Or is this somehow connected to the spherical expansion of light around
the source?
Wavelength of light is measured by interference, true ?
Frequency and amplitude is measured how ?
A moving source of sound ( a train riding and whistling) is changing
wavelength of sound in difference to being at rest. When the train is
at rest and i am moving towards him in another train, frequency
changes. Can this be observed with light too? (Andromeda is moving
towards us or we are moving towards Andromeda?)Please just
kindergarten-physics.
Thanks and a sunny day for tomorrow
Hero

On a sunny day (28 Sep 2005 12:28:12 -0700) it happened
wrote in
.com:

Jan Panteltje wrote:
On a sunny day (28 Sep 2005 08:05:36 -0700) it happened
wrote
...
And a third: are the physicists able to measure
amplitude, frequency and wavelength of light ?
yes
Hi, Charles Sam, Divan and Jan
Thanks ( and bedankt) for Your quick responses.
So may be You are willing to answer some mo
In water-waves there's a lot of energy in amplitude, how about light,
is light amplitude connected to energy ?
Or is this somehow connected to the spherical expansion of light around
the source?
Wavelength of light is measured by interference, true ?
Could be done that way.

Frequency and amplitude is measured how ?
Amplitude is in fact intensity, from the particle point of view how many
photons per unit of time hit the detector.
From the wave point of view 'intensity', for example the heat (IR radiation)
you feel will be stronger if the amplitude of that radiation is bigger
(for the same frequency).


As for this photon business, it is difficult to grasp.
If an electron jumps back to a lower orbit in an atom, then it emits energy,
an 'energy quantum'.
You could perhaps think of it as a wave packet, with a specific frequency.
It gets more difficult (at least for me) as you indeed expect this to radiate
in all directions, but maybe the correct way of looking at it is 'on average
all directions', the electron has a probability path.
In such a case one photon would go one way, and the next an other way..
Better read up on quantum mechanics and the Schroeder equation, that describes
stuff like this.

A moving source of sound ( a train riding and whistling) is changing
wavelength of sound in difference to being at rest. When the train is
at rest and i am moving towards him in another train, frequency
changes. Can this be observed with light too?
Yes Doppler effect.
Only funny thing is that fisicists say that in Doppler in the case of sound
the speed of you relative to the air changes.. but in case of light (as
sound was a medium) they pretend there is no aether and then explain Doppler
for light by claiming the relative speed for light to you (the observer) is
always c... sort of an Einstein postulate, but we know there is an aether.
To fix this, fisicists have now come up with the 'non emtpy vacuum', the
'quantum vacuum'.
So they can always claim 'yes we were always right there is no aether,
but it is the 'QV'.

As you can see from this I am no fisicist, and Al is a chemist.
Wormly a cut and paste parrot.
Meron is real, but limited to Xrays...
Androcles agrees with me that it all is strange, and something does not figure.
All together we will never get a Nobel for fisicks I'm sure.


(Andromeda is moving
towards us or we are moving towards Andromeda?)Please just
kindergarten-physics.
Yes, light from far away stars seems to be shifted towards the red (the spectral bands
from the elements), so they conclude stuff is moving away (or we away from it).
The more red, the faster the speed....
And from some other data they have distance (brightness for example).
So they find far away stars are redder.
Anyways given the speed of light, we can see in the past.
Light from stars X lightyears away reaches us only after X years....
They find incredible redshifts for start that are almost 14 billion years old.
Cannot make the link to the big bang now... does not figure.

fisics is full of hypothesis.
I WOULD like to hear the theories a million years in the future, if humanity
still exists (existed), and what they would say about 21 century fisicks.



Thanks and a sunny day for tomorrow
Hero

I did not write any of this....
Late, had brain switched off, want to watch Dylon on TV.

wrote in message
ups.com...
| Light moving through water or glass is slower. As
| wavelength * fraquency = speed,
| what changes: wavelength, frequency or both ?

Both.

| Another question: what we observe as the colour of light,
| does this correspond to energy, frequency or wavelength ?

All.
E = h.frequency = h(c/n+v)/wavelength


| And a third: are the physicists able to measure
| amplitude,
No.

| frequency
No.

| and wavelength of light ?
Yes.

Androcles.

wrote in message
oups.com...
| Jan Panteltje wrote:
| On a sunny day (28 Sep 2005 08:05:36 -0700) it happened
| wrote
| ...
| And a third: are the physicists able to measure
| amplitude, frequency and wavelength of light ?
| yes
| Hi, Charles Sam, Divan and Jan
| Thanks ( and bedankt) for Your quick responses.
| So may be You are willing to answer some mo
| In water-waves there's a lot of energy in amplitude, how about light,
| is light amplitude connected to energy ?

http://lectureonline.cl.msu.edu/~mmp...fect/photo.htm



| Or is this somehow connected to the spherical expansion of light
around
| the source?

No.


| Wavelength of light is measured by interference, true ?

http://hyperphysics.phy-astr.gsu.edu...t/grating.html


| Frequency and amplitude is measured how ?

Calculated.



| A moving source of sound ( a train riding and whistling) is changing
| wavelength of sound in difference to being at rest. When the train is
| at rest and i am moving towards him in another train, frequency
| changes. Can this be observed with light too?

Yes.
c+u
f' = f-------------
c+v

(Andromeda is moving
| towards us or we are moving towards Andromeda?)

The chicken clucked across the road "How do I get to the other side?"
The other chicken replied "You are on the other side".
Androcles


Please just
| kindergarten-physics.
| Thanks and a sunny day for tomorrow
| Hero
|