Betulkah teori ni????

mbhcsf · Post time 30-5-2003 02:03 AM

Originally posted by Sarah_Radzi at 2003-5-30 01:35:
ade benda yang speed lebih laju dari c .. samada "vitesse de groupe " atau "vitesse de phase" (sorrylah tak tahu term english ape dia ..and i dah tak ingat sangat )

fenomen ...

bonjour , madame.
cares to explain all those vittesse de group...berkenaan ape..you hit my eyes of interest...no comprende...
adieu..

Sarah_Radzi · Post time 30-5-2003 04:46 AM

imagine AM modulation ... low frequency signal disuperimpose dengan high frequency signal .. kalau observe signal high frequency tu macam ada envelope

vitesse de groupe (propagation group velocity) : kelajuan envelope tu bergerak dari point A to point B..
vitesse de phase (propagation angular velocity): kelajuan a fix angle utk bergerak ke next nearest point having the same angle

tengok gambar ..

kelajuan benda ni yang boleh jadi lagi laju dari speed of light.
benda ni jadi biler some conditions are attained.

restrained relativity cakap : no object having a mass (or energy since E=mc

Sarah_Radzi · Post time 30-5-2003 04:48 AM

yag kuning tu vitesse de phase, yang merah tu vitesse de groupe ..

mbhcsf · Post time 30-5-2003 11:47 AM

salam..
oh ok ..i faham a little bit sbb yes in form 5 physic we did learn about frequency modulation in tv/radio system ..and so on.....how to modulate sound wave to radio wave.... yes faham jugak sikit-sikit pasal enveloping effect tu ..oh now i can see the relevance of this thing....bless you....
....

[ Last edited by mbhcsf on 30-5-2003 at 11:51 AM ]

mbhcsf · Post time 30-5-2003 11:56 AM

salam again..

kalau FM waveform ade tak component nie?

Sarah_Radzi · Post time 30-5-2003 05:32 PM

ini bukan limited kepada am modulation .. this is general to wave propagation ... yang i cakap pasal AM sbb nak explain pasal envelope tu .. but it can be any wave ..

mbhcsf · Post time 30-5-2003 05:38 PM

Originally posted by Sarah_Radzi at 2003-5-30 17:32:
ini bukan limited kepada am modulation .. this is general to wave propagation ... yang i cakap pasal AM sbb nak explain pasal envelope tu .. but it can be any wave ..

oh is it...thank you..and bless you...
haey menarik lah pasal optics science nie...any interesting news in this field lately?

Sarah_Radzi · Post time 30-5-2003 07:11 PM

itu bukan field i ..
last skali i dengar pasal org re-interested ngan
* soliton ...
* interferometry utk buat macam macam (ape i dah tak ingat)
* fiber optik berlubang
* optical CDMA dalam fiber optic and free space ..

tu je lah yang i dengar ..lain tu tak tahu ler ..

Show all posts · Post time 31-5-2003 06:37 AM

Sekarang ni aku lak yg fenin bila masuk je Sarah. Hebat tul Sarah ni..

mbhcsf · Post time 31-5-2003 11:30 AM

salam..
fiber optic berlubang...?? and it does not cause any aberration in the light pathway?

ni level SPM je kak. ye..tapi saya nak tanya ...fibre optic nie at the basic level/ in the principle just adopt the concept of "pantulan dlm penuh" right? so if it has "lubang' then ..mam mane ia berfungsi??

Milo_Ice · Post time 31-5-2003 05:05 PM

Originally posted by Fie'Z'idane at 2003-5-27 06:34 PM:
Bahan yang tak de jirim cuma ada 2 sama ada bentuk gelombang ataupun bentuk vakum. Jadi gelombang elektromagnet cam Sinar Gama cth yg terbaik.

Nanti!

Gelombang? Wave right? hyperspace is vacuum. WHAT does light use to wave through hyperspace, from sun to earth?

Sarah_Radzi · Post time 31-5-2003 06:46 PM

Originally posted by mbhcsf at 2003-5-31 05:30:
salam..
fiber optic berlubang...?? and it does not cause any aberration in the light pathway?

ni level SPM je kak. ye..tapi saya nak tanya ...fibre optic nie at the basic level/ in the principl ...

if i'm not mistaken, they are using this fiber optic utk detect petrol dalam laut, ..
light can go thru .. so they can see under the deep ocean, and the gas can come up ikut lubang tu, so they can detect what gas is it.... apparently it works .. tapi detail lagi camne dia berfungsi .. i tak tahu .. i tengok to kat satu simposium masa i dekat nak abis belajar ..

actually, kalau ade lubang pun.. as long as hukum snell tu respected, everything will be fine ..

Sarah_Radzi · Post time 31-5-2003 07:00 PM

Originally posted by Milo_Ice at 2003-5-31 11:05:
Nanti!

Gelombang? Wave right? hyperspace is vacuum. WHAT does light use to wave through hyperspace, from sun to earth?

light is modelised by photons ...

light itself is a electromagnetic waves .. which propagates from one source to somewhere else ..

in the case fo sun to earth light ... these photons are supllied by the sun.. and they move towards earth (and all other places) ...

photons have no mass .. so the space is still vacuum ;)

mbhcsf · Post time 31-5-2003 10:05 PM

Originally posted by Sarah_Radzi at 2003-5-31 18:46:
if i'm not mistaken, they are using this fiber optic utk detect petrol dalam laut, ..
light can go thru .. so they can see under the deep ocean, and the gas can come up ikut lubang tu, so they c ...

salam..
oh now i see..
thanks..
nanti kalau ade apa-apa saya tanya you lagi..
au revoir

Milo_Ice · Post time 1-6-2003 05:32 PM

Originally posted by Sarah_Radzi at 2003-5-31 07:00 PM:
light is modelised by photons ...

light itself is a electromagnetic waves .. which propagates from one source to somewhere else ..

in the case fo sun to earth light ... these photons are s ...

But sound is wave too, and sound have no mass. But we cannot wave sound in vacuum environment.:cf:

Sarah_Radzi · Post time 1-6-2003 06:55 PM

sound wave propagates via the vibration of mass.. if there is no mass, no vibration .. then no sound .. that's why there is no sound in a vacuum environment

Milo_Ice · Post time 2-6-2003 06:09 AM

Oh man, I don't really know these things!

I wander how could I get A1 from science subject in SPM.

Kakaka

mbhcsf · Post time 2-6-2003 12:13 PM

Originally posted by Milo_Ice at 2003-6-2 06:09:
Oh man, I don't really know these things!

I wander how could I get A1 from science subject in SPM.

Kakaka

hi Milo Ice..,,please to meet you..
it's not in SPM curricullum laaa... it has been stated in form 2 ...remember chapter 1 ( kbsm) ?
wow that 's good A1 in rampaian science or pure science? err sorry mind me asking..congratulations...

SO Madame SARAh RAdzi what 's your field of study then? cares to share with us?i like constructive scientific discussion

[ Last edited by mbhcsf on 2-6-2003 at 12:15 PM ]

Sarah_Radzi · Post time 2-6-2003 06:06 PM

Originally posted by mbhcsf at 2003-6-2 06:13:
hi Milo Ice..,,please to meet you..
it's not in SPM curricullum laaa... it has been stated in form 2 ...remember chapter 1 ( kbsm) ?
wow that 's good A1 in rampaian science or pure science? err s ...

mbhcsf :field of studies ? wireless communication .. specialized kat channel coding ...

Milo Ice : don't worry .. spm sylabbus is very incomplete compared to french baccalaureat.. esp physics, chemistry and math (add math included) .. french ppl took baccalaureat at the age of 17 (average) .. but they know a lot more than our spm candidates ..