Optics B/C

cngu23
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Re: Optics B/C

Postby cngu23 » February 27th, 2012, 7:20 pm

There really isnt a need to if the binder is already split into 2 sections. And I'm pretty sure you are allowed to take stuff straight out of the binder once competition starts.
Instead of using a whole sheet for a template, and having to fold it so it fits in the laser shoot box, can I just bring a very small sheet of paper, with only a mirror that has a 45 degree laser beam ray on it, and just punch one hole in it?
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DivineBbbbbeast
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Re: Optics B/C

Postby DivineBbbbbeast » February 27th, 2012, 7:35 pm

There really isnt a need to if the binder is already split into 2 sections. And I'm pretty sure you are allowed to take stuff straight out of the binder once competition starts.
Instead of using a whole sheet for a template, and having to fold it so it fits in the laser shoot box, can I just bring a very small sheet of paper, with only a mirror that has a 45 degree laser beam ray on it, and just punch one hole in it?
Well, I would just just have it pre-cut before hand,and then inserted into like a sheet protector or something. Then, I'd take the sheet protector out of the binder for the laser shoot. I dont know, whatever floats your boat.
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Re: Optics B/C

Postby chalker » February 27th, 2012, 8:54 pm

Does anyone know if it would it be illegal to hole punch (drill :roll: ) a binder and stick it within the binder.... So that upon the start of the competition one could remove it... Thereby having a binder for the geometric portion and the physical portion... I would assume so but I haven't read anything preventing that and honestly hadn't thought of it until now.
I would think it may be against the spirit of the rules, but I think you should let Chalker give you an unofficial clarification about it (or another notable supervising figure, for that matter).

Unofficially of course, I concur.

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Seracon
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Re: Optics B/C

Postby Seracon » February 28th, 2012, 8:14 am

A question I stumbled upon...
Light of wavelength 500 nm shines on a soap film (n=1.46). For what soap film thickness, other than the minimum thickness, will constructive interference occur?
I have no idea how to start...any help? Thanks!
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Re: Optics B/C

Postby Osennecho » February 28th, 2012, 1:43 pm

A question I stumbled upon...
Light of wavelength 500 nm shines on a soap film (n=1.46). For what soap film thickness, other than the minimum thickness, will constructive interference occur?
I have no idea how to start...any help? Thanks!
Constructive interference occurs at odd multiples 1t, 3t,5t, etc where t=thickness and is the following equation: t=λ/(4n). The minimum would be at 1t and thus the next smallest would be at 3t. So multiply the value from t=λ/(4n) by 3 and you should get 257nm. :D
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Re: Optics B/C

Postby smartkid222 » February 28th, 2012, 3:14 pm

There really isnt a need to if the binder is already split into 2 sections. And I'm pretty sure you are allowed to take stuff straight out of the binder once competition starts.
Instead of using a whole sheet for a template, and having to fold it so it fits in the laser shoot box, can I just bring a very small sheet of paper, with only a mirror that has a 45 degree laser beam ray on it, and just punch one hole in it?
Since the templates are not references, which need to be 3-hole punched as described section 2b of the rules, I would say they do not need to be hole punched at all. (Templates are in Section 2a). Nevertheless, I do put them in a sheet protector for good measure.
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cngu23
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Re: Optics B/C

Postby cngu23 » February 28th, 2012, 3:25 pm

A question I stumbled upon...
Light of wavelength 500 nm shines on a soap film (n=1.46). For what soap film thickness, other than the minimum thickness, will constructive interference occur?
I have no idea how to start...any help? Thanks!
Constructive interference occurs at odd multiples 1t, 3t,5t, etc where t=thickness and is the following equation: t=λ/(4n). The minimum would be at 1t and thus the next smallest would be at 3t. So multiply the value from t=λ/(4n) by 3 and you should get 257nm. :D
So destructive interference would occur starting at λ/2n?
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Re: Optics B/C

Postby Osennecho » February 28th, 2012, 4:24 pm

A question I stumbled upon...
Light of wavelength 500 nm shines on a soap film (n=1.46). For what soap film thickness, other than the minimum thickness, will constructive interference occur?
I have no idea how to start...any help? Thanks!
Constructive interference occurs at odd multiples 1t, 3t,5t, etc where t=thickness and is the following equation: t=λ/(4n). The minimum would be at 1t and thus the next smallest would be at 3t. So multiply the value from t=λ/(4n) by 3 and you should get 257nm. :D
So destructive interference would occur starting at λ/2n?
I believe so, with deconstructive interference occurring at even multiples (It's actually even 180 degree phase changes and such, which gets to complicated for me to be able to explain without failing miserably so I have simply said even multiples for deconstructive and odd for constructive as that should generally be enough to solve).
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2012 Events: (Regionals, States, Nationals); N/A=conflict
Astronomy (6th, 7th, 16th)
Dynamic Planet (N/A, N/A, 11th)
Optics (2nd, 3rd, 5th)
Remote Sensing (N/A, 5th, 47th)

Team Overall (3rd, 2nd, 14th)
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cngu23
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Re: Optics B/C

Postby cngu23 » February 28th, 2012, 4:35 pm

A spaceship is moving away from an asteroid at a relative velocity of 2.8481 x 10^8 m/s. The spaceship sends a signal with a frequency of 5 x 10^6 Hz to a base located on the asteroid. What is the frequency of the signal measured by the base?
This is From the Camas Division B test. I'm using the doppler shift equation but I get a answer that doesn't match that of the answer key. I am using 0 for speed of observer and 2.6461 x 10^8 for speed of the source.

Also, what time what you use the equation for redshift/blueshift. http://www.wolframalpha.com/input/?i=re ... th+formula
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Re: Optics B/C

Postby JSGandora » February 28th, 2012, 4:38 pm

If it's moving away, then the wavelength will increase therefore it's a red shift. If it's moving closer, then the wavelength will decrease meaning it will be a blue shift.


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