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by jkang
April 5th, 2017, 6:30 pm
Forum: 2017 Question Marathons
Topic: Optics B/C
Replies: 127
Views: 12185

Re: Optics B/C

Okay. After thinking a while, I think I have some idea.|The first signal S to arrive at that point x produces the smallest relaxation time of any frequency of the light. As frequency increases to this frequency, the relaxation time of the dielectric keeps decreasing and thus the signal propagates f...
by jkang
April 4th, 2017, 5:57 pm
Forum: 2017 Lab Events
Topic: Optics B/C
Replies: 190
Views: 28959

Re: Optics B/C

4.d.xii. The word "measurement" is used. Does this suggest to you that there might be laboratory work in addition to the box? I admittedly haven't looked closely at the S/N topics until this month. If I was writing for states/nats, I'd print a figure and either give a scale or make it to scale, the...
by jkang
April 3rd, 2017, 7:58 pm
Forum: 2017 Question Marathons
Topic: Optics B/C
Replies: 127
Views: 12185

Re: Optics B/C

Is this just simply...|By definition of the index of refraciton, n=c/v, where v is the speed of the electromagnetic radiation in the dielectric medium. Therefore, wouldn't s, the speed of the signal, just be c/n? Surprisingly and yet unsurprisingly, this is false. I'd recommend thinking more about ...
by jkang
April 3rd, 2017, 4:16 pm
Forum: 2017 Question Marathons
Topic: Optics B/C
Replies: 127
Views: 12185

Re: Optics B/C

Here's an interesting question from my graduate course. Suppose electromagnetic radiation propagates though a neutral dielectric in a region of normal dispersion. The medium has a refractive index n . Let s be the signal that first arrives at point x within the medium. At what velocity does s propag...
by jkang
April 3rd, 2017, 4:06 pm
Forum: 2017 Lab Events
Topic: Optics B/C
Replies: 190
Views: 28959

Re: Optics B/C

On the contrary, I would argue that being able to do these problems without your calculator is a useful skill and should be even faster than typing it into your calculator (especially if you have a bunch of trig that you have to locate in the menus) Tbh by the time I reached senior year (I got my 8...
by jkang
April 3rd, 2017, 9:05 am
Forum: 2017 Question Marathons
Topic: Optics B/C
Replies: 127
Views: 12185

Re: Optics B/C

Polarized light of intensity I strikes a rotating polarizing film whose angle is given by arcsin(1/t) where t is time in seconds. At one time does exactly 25% of the initial intensity of the polarized light get through the film? No one's tried in a while, so let me.|Malus' law states I = I0cos(x). ...
by jkang
March 29th, 2017, 12:50 pm
Forum: 2017 Lab Events
Topic: Optics B/C
Replies: 190
Views: 28959

Re: Optics B/C

However, more attempts to isolate x were unsuccessful. If you can, invest in a calculator like the TI-89. Perfectly allowed by the rules, and has an algebra solver in it. In something like SciO you really shouldn't have the time to do this by hand, this saves so much time (and is applicable in many...
by jkang
March 25th, 2017, 10:08 pm
Forum: 2017 Invitationals, Regionals, and States
Topic: Texas 2017
Replies: 129
Views: 20732

Re: Texas 2017

Results for the UT Austin regional are now available for Division B and Division C.
by jkang
March 25th, 2017, 8:01 pm
Forum: 2017 Lab Events
Topic: Optics B/C
Replies: 190
Views: 28959

Re: Optics B/C

With the UT Regional now over, here are my test and key for the tournament. I included explanations for each of my answers in the key this time, so hopefully that will help. Topics are a bit heavy on waves so unlikely to be seen at states/nats, but wave optics >> geometric optics :P
by jkang
March 14th, 2017, 10:43 pm
Forum: 2017 Lab Events
Topic: Optics B/C
Replies: 190
Views: 28959

Re: Optics B/C

Hi guys, Can someone explain how to solve this problem? It was on the question marathon (page 3 or 4 I think, kenniky's problem on angle of deviation in prisms) Thanks! Question: In the prism below, α is 35° and θ is 19°. The prism has index of refraction 1.45 and is in a vacuum What is the deviati...

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