No, I mean, plane waves are a special case, what is the general form?
Science quiz
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Guest_Mirai Naza
, Jun 04 2006 09:42 PM
981 replies to this topic
#776
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Posted 08 December 2006 - 04:11 PM
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Posted 08 December 2006 - 04:15 PM
Oh, I see...forgot the context of the question. Yeah, plane waves general satisfy the equation: 
, where i is the imaginary unit, k is the wave vector, ω is the angular frequency, and a is the complex amplitude.
, where i is the imaginary unit, k is the wave vector, ω is the angular frequency, and a is the complex amplitude.
#778
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Posted 08 December 2006 - 04:18 PM
You still didn't get the question. Plane waves are a special case. Replace the plane by another geometric form to get the general case.
#779
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Posted 08 December 2006 - 04:33 PM
I still don't understand. Do you mean one-dimensional plane waves? That would just be the D'Alembert equation...
#780
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Posted 08 December 2006 - 04:46 PM
Never mind, the answer was spherical wave.272. What does the theorem of Huygens-Fresnel tell? (2 points)Score board:Eärendil - IIRed Anvil - IIatomicknight - ICoatlicue - Ibasf11214 - 33SirAnthos - 4
#781
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Posted 08 December 2006 - 06:01 PM
1. each point of an advancing wave front is the center of a fresh disturbance and therefore the source of a new train of waves2. the advancing wave as a whole can be thought of as sum of all the secondary waves originating from points in the medium already traversed
#782
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Posted 08 December 2006 - 06:03 PM
Correct.273. Which phenomenon does it describe? (2 points)Score board:Eärendil - IIRed Anvil - IIatomicknight - ICoatlicue - Ibasf11214 - 35SirAnthos - 4
#783
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Posted 08 December 2006 - 06:08 PM
Diffraction and refraction.
#784
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Posted 08 December 2006 - 06:11 PM
Diffraction mainly.274. What does "transversal" mean for a wave? (2 points)Score board:Eärendil - IIRed Anvil - IIatomicknight - ICoatlicue - Ibasf11214 - 37SirAnthos - 4
#785
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Posted 08 December 2006 - 06:13 PM
it causes disturbances in the medium perpendicular to its direction of advancement
#786
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Posted 08 December 2006 - 06:14 PM
The wave moves up and down, simular to a wave of a water, they dont interfear or crash agianst each other; but move as a pattern.
#787
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Posted 08 December 2006 - 06:16 PM
basf11214 is correct.275. What does LASER stand for? (1 point)Score board:Eärendil - IIRed Anvil - IIatomicknight - ICoatlicue - Ibasf11214 - 39SirAnthos - 4
#788
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Posted 08 December 2006 - 06:17 PM
Light Amplified by the Stimulated Emission of Radiation
#789
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Posted 08 December 2006 - 06:19 PM
>_> cant you do something related to space and time or something 
?
?
#790
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Posted 08 December 2006 - 06:23 PM
basf11214 is correct. The quiz is organized by theme and until 300, all questions are related to electromagntism.276. What is the reflexion index for a perfect metal? (2 points)Score board:Eärendil - IIRed Anvil - IIatomicknight - ICoatlicue - Ibasf11214 - 40SirAnthos - 4
#791
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Posted 08 December 2006 - 06:41 PM
optical or electrical reflection?
#792
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Posted 08 December 2006 - 06:44 PM
There is no electrical reflexion.
#793
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Posted 08 December 2006 - 07:33 PM
I'll take a guess....is it zero?
#794
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Posted 08 December 2006 - 07:46 PM
Sorry, the answer is incorrect. Think of how much a perfect mirror would reflect.
#795
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Posted 08 December 2006 - 08:20 PM
Is it infinite?
#796
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Posted 08 December 2006 - 08:22 PM
Infinite would mean: with a finite energy incident wave, you obtain an infinite energy reflected wave... can't be correct.
#797
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Posted 09 December 2006 - 03:39 PM
It is 1, the index is the relation between incident energy and reflected energy.
He saw the Mountain silent rise
where twilight lies upon the knees
of Valinor, and Eldamar
beheld afar beyond the seas.
#798
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Posted 09 December 2006 - 03:57 PM
Correct.276. What is the conductivity value for a perfect metal? (2 points)Score board:Eärendil - IIRed Anvil - IIatomicknight - ICoatlicue - Ibasf11214 - 40SirAnthos - 4Eärendil - 2
#800
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Posted 09 December 2006 - 04:02 PM
Correct.277. What is an evanescent wave? (2 points)Score board:Eärendil - IIRed Anvil - IIatomicknight - ICoatlicue - Ibasf11214 - 40SirAnthos - 4Eärendil - 2NoFox - 2
