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Topic: Physical Chemistry 2 questions  (Read 6302 times)

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Offline ksack001

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Physical Chemistry 2 questions
« on: February 02, 2009, 05:11:05 PM »
I am having trouble understanding this problem and answering it can anyone guide me in the right direction, I attached a word file of the problem? I know it has to do with the particle in the box theory which I understand the basics of but I cant figure out this graph and apply what i know. Thanks
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Offline _cheers

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Re: Physical Chemistry 2 questions
« Reply #1 on: February 16, 2009, 01:48:17 AM »
Yes, its a particle in a 1-D box. E1 corresponds to n=1. At n=1 what is the energy? Its ground state, so there is no energy (ignoring zero-point energy). When looking at a wave, energy corresponds to the number of nodes in a wave (simplest explanation). So, zero energy, zero nodes. At E2, n=2. 1 node...and it goes up from there...n=3 you get 2 nodes etc etc. So, you just need to draw a sin wave with no nodes and one node.

I'm not totally sure what is meant by part b. But I'm guessing they want a wave equation to go with a, b, c..
find the length (x) at a,b,c and stick that in the wave equation with n=1 and n=2 (depending on which wave your using)

hope that helps some....
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Offline ksack001

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Re: Physical Chemistry 2 questions
« Reply #2 on: February 17, 2009, 01:35:23 AM »
Thanks I firgured out what you described in part A. for part B not too sure yet but im assuming i just use the aprox length and the equation as you described thats as far as i got and what I believe is correct. I dont know about c or d yet
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Offline _cheers

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Re: Physical Chemistry 2 questions
« Reply #3 on: February 17, 2009, 02:07:35 AM »
I think you could just use length a/L, b/L, c/L
 
sorry, i didnt even see the other parts and I see you have to deal with Tunnelling....

when is this due? I'll look at it tommorrow and see if I can help.
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Love is a matter of Chemistry, but sex is a matter
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Offline ksack001

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Re: Physical Chemistry 2 questions
« Reply #4 on: February 22, 2009, 01:05:51 AM »
its not due its like a practice thing we already had the exam a while back but i want to be able to competely do this problem without any problems when the final comes i know something similar will be on there
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Offline _cheers

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Re: Physical Chemistry 2 questions
« Reply #5 on: February 22, 2009, 02:23:24 AM »
I did look at it...but I'm at a loss  :-\  take a look at your notes on tunnelling and probability...I looked but am unsure how to apply it to your weird diagram.
Have you tried posting on a physics forum or on cramster? Usually a moderator on cramster will answer if no one else does....
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Love is a matter of Chemistry, but sex is a matter
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- Unknown

Offline ksack001

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Re: Physical Chemistry 2 questions
« Reply #6 on: February 22, 2009, 02:41:38 AM »
Ya I know the thing is wierd I havent posted anywhere else I will just go bother the teacher I can never find.
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