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OfflineMadtowntripper
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Geophysics is kicking my ass...
    #4654134 - 09/13/05 10:51 AM (11 years, 2 months ago)

I hate physics.  I'm a geosciences major though, so I need a couple of geophysics courses to graduate.  So here I sit, at 9 in the morning trying to figure out how you calculate angles of refraction.

Someone use Snell's Law to tell me the following: if the velocity in the firs tlayer is 1.8 km/s, and the velocity in the second layer is 2.7 km/s, and the angle of incidence is 25 degrees, what the fuck is the angle of refraction?

:eek:


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After one comes, through contact with it's administrators, no longer to cherish greatly the law as a remedy in abuses, then the bottle becomes a sovereign means of direct action.  If you cannot throw it at least you can always drink out of it.  - Ernest Hemingway

If it is life that you feel you are missing I can tell you where to find it.  In the law courts, in business, in government.  There is nothing occurring in the streets. Nothing but a dumbshow composed of the helpless and the impotent.    -Cormac MacCarthy

He who learns must suffer. And even in our sleep pain that cannot forget falls drop by drop upon the heart, and in our own despair, against our will, comes wisdom to us by the awful grace of God.  - Aeschylus


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InvisibleBoom
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Re: Geophysics is kicking my ass... [Re: Madtowntripper]
    #4654146 - 09/13/05 10:57 AM (11 years, 2 months ago)

You tell us, Geoscience-boy :smirk:


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InvisibleHELLA_TIGHT
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Re: Geophysics is kicking my ass... [Re: Madtowntripper]
    #4654333 - 09/13/05 12:07 PM (11 years, 2 months ago)

32 degrees


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OfflineWorldbridger
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Re: Geophysics is kicking my ass... [Re: HELLA_TIGHT]
    #4654537 - 09/13/05 01:13 PM (11 years, 2 months ago)

58 degrees


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InvisibleHELLA_TIGHT
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Re: Geophysics is kicking my ass... [Re: Worldbridger]
    #4654543 - 09/13/05 01:14 PM (11 years, 2 months ago)

Are you sure?


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Invisiblemantis
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Re: Geophysics is kicking my ass... [Re: Worldbridger]
    #4654550 - 09/13/05 01:15 PM (11 years, 2 months ago)

How'd you get that? I got to sin(x) = .633927 and I realized I fucked something up.


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InvisibleHELLA_TIGHT
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Re: Geophysics is kicking my ass... [Re: mantis]
    #4654556 - 09/13/05 01:16 PM (11 years, 2 months ago)

You forgot to subtract the boolean logic, fool.


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InvisibleHELLA_TIGHT
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Re: Geophysics is kicking my ass... [Re: HELLA_TIGHT]
    #4654558 - 09/13/05 01:16 PM (11 years, 2 months ago)

Wait... where did you guys put the AND?


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Invisiblephalloidin

Registered: 07/03/04
Posts: 865
Re: Geophysics is kicking my ass... [Re: Madtowntripper]
    #4654733 - 09/13/05 01:51 PM (11 years, 2 months ago)

I got 16.4 degrees

1.8 sin(25)=2.7 sin(x)
sin(x)=(1.8 sin(25))/2.7
arcsin(.2817)=16.4


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OfflineMadtowntripper
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Re: Geophysics is kicking my ass... [Re: phalloidin]
    #4654986 - 09/13/05 02:53 PM (11 years, 2 months ago)

I'd tell you if you were right, but I just got done listening to my prof tell me the answers for over an hour, and I still dont know WTF he's talking about....

I'm not stupid by any means. I've done plenty of field applications and understand geology well, but this shit is just like math, in one ear and out the other...


--------------------
After one comes, through contact with it's administrators, no longer to cherish greatly the law as a remedy in abuses, then the bottle becomes a sovereign means of direct action.  If you cannot throw it at least you can always drink out of it.  - Ernest Hemingway

If it is life that you feel you are missing I can tell you where to find it.  In the law courts, in business, in government.  There is nothing occurring in the streets. Nothing but a dumbshow composed of the helpless and the impotent.    -Cormac MacCarthy

He who learns must suffer. And even in our sleep pain that cannot forget falls drop by drop upon the heart, and in our own despair, against our will, comes wisdom to us by the awful grace of God.  - Aeschylus


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Invisiblemantis
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Re: Geophysics is kicking my ass... [Re: phalloidin]
    #4655029 - 09/13/05 03:02 PM (11 years, 2 months ago)

That sounds about right. You just use the appropriate numbers in the equation and solve for x.

Right?


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Offlinezenmunk
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Re: Geophysics is kicking my ass... [Re: mantis]
    #4655229 - 09/13/05 03:45 PM (11 years, 2 months ago)

physics make me cry :frown:


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Like a meteor, like darkness, as a flickering lamp, An illusion, like hoar-frost or a bubble, Like clouds, a flash of lightning, or a dream: So is all conditioned existence to be seen. -buddha


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Invisiblephalloidin

Registered: 07/03/04
Posts: 865
Re: Geophysics is kicking my ass... [Re: mantis]
    #4655240 - 09/13/05 03:49 PM (11 years, 2 months ago)

ohh, yeah I used the velocity instead of the index of refraction.
n1=3.0*10^8/1800
n2=3.0*10^8/2700
so:
n1*sin(25)=n2*sin(x)
divide both sides by 3.0*10^8
then you get
sin(25)/1800=sin(x)/2700
so 2700*sin(25)/1800=sin(x)
x=39.3

you had it right, you just had to take the arcsin of .633927

looking back, my first answer is obviously wrong because the angle of refraction is less than the angle of incidence. When the velocity in the first medium is less than that of the second medium, then the light will always bend away from the normal, so the angle of refraction has to be greater than the angle of incidence.


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InvisibleRandalFlagg
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Re: Geophysics is kicking my ass... [Re: phalloidin]
    #4655261 - 09/13/05 03:54 PM (11 years, 2 months ago)

Quote:

MrTryptastic said:
looking back, my first answer is obviously wrong because the angle of refraction is less than the angle of incidence. When the velocity in the first medium is less than that of the second medium, then the light will always bend away from the normal, so the angle of refraction has to be greater than the angle of incidence.




Wha...? Huh..??


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Invisiblemantis
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Re: Geophysics is kicking my ass... [Re: phalloidin]
    #4655282 - 09/13/05 03:59 PM (11 years, 2 months ago)

Damn, I guess I should have more faith in my mathematical ability. I wasn't sure how to get rid of that sin(x) but I see you just take sin^-1(x) to get it.

Fucking nifty! :yesnod:


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InvisibleRandalFlagg
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Re: Geophysics is kicking my ass... [Re: mantis]
    #4655296 - 09/13/05 04:03 PM (11 years, 2 months ago)

Quote:

mantis said:
Damn, I guess I should have more faith in my mathematical ability. I wasn't sure how to get rid of that sin(x) but I see you just take sin^-1(x) to get it.

Fucking nifty! :yesnod:




:imslow:  :drool2:


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