/-/https/www.sciencebuddies.org/cdn/Files/21464/5/sb-logo.png){kind=logo}
/-/https/www.sciencebuddies.org/cdn/Files/21464/5/sb-logo.png){kind=logo}
Measuring Sugar Content of a Liquid
Moderators: kgudger, bfinio, MadelineB, Moderators
-
haa12renaissance
- Posts: 5
- Joined: Tue Jan 13, 2009 7:33 pm
- Occupation: Student
- Project Question: For the "Measuring Sugar Content of a Liquid with a Laser Pointer" project http://www.sciencebuddies.org/science-f ... p028.shtml, where does equation (1) come from and what is/are a good research source(s) for it
- Project Due Date: Wednesday, January 14, 2009 (TOMORROW!!!!)
- Project Status: I am conducting my research
Measuring Sugar Content of a Liquid
Where did the author get "the prism equation" from?
Last edited by haa12renaissance on Tue Feb 17, 2009 11:40 pm, edited 3 times in total.
-
deleted-71447
- Former Expert
- Posts: 1019
- Joined: Fri Oct 28, 2005 11:43 am
- Occupation: Research Hydrologist
- Project Question: n/a
- Project Due Date: n/a
- Project Status: Not applicable
Re: Measuring Sugar Content of a Liquid with a Laser Pointer
Hi haa12renaissance,
That equation is derived from Snell's law based on the geometry of the prism. It is sometimes called the "prism equation". You can find references by searching for the term:
"prism equation" "minimum deviation".
Physics for Scientists and Engineers by Lawrence S. Lerner is one reference that ought to pop up.
http://books.google.com/books?id=B8K_ym ... &ct=result
Let us know if you have any problems finding that.
Chris
That equation is derived from Snell's law based on the geometry of the prism. It is sometimes called the "prism equation". You can find references by searching for the term:
"prism equation" "minimum deviation".
Physics for Scientists and Engineers by Lawrence S. Lerner is one reference that ought to pop up.
http://books.google.com/books?id=B8K_ym ... &ct=result
Let us know if you have any problems finding that.
Chris
-
haa12renaissance
- Posts: 5
- Joined: Tue Jan 13, 2009 7:33 pm
- Occupation: Student
- Project Question: For the "Measuring Sugar Content of a Liquid with a Laser Pointer" project http://www.sciencebuddies.org/science-f ... p028.shtml, where does equation (1) come from and what is/are a good research source(s) for it
- Project Due Date: Wednesday, January 14, 2009 (TOMORROW!!!!)
- Project Status: I am conducting my research
Keeping L constant...
How could equation (4) be modified?
Last edited by haa12renaissance on Tue Feb 17, 2009 11:39 pm, edited 2 times in total.
-
deleted-71447
- Former Expert
- Posts: 1019
- Joined: Fri Oct 28, 2005 11:43 am
- Occupation: Research Hydrologist
- Project Question: n/a
- Project Due Date: n/a
- Project Status: Not applicable
Re: Measuring Sugar Content of a Liquid with a Laser Pointer
I believe you would divide both sides by 2.00056, take the inverse sine of both sides, and then some additional algebra.
Does that help? Good luck!
Chris
Does that help? Good luck!
Chris
-
haa12renaissance
- Posts: 5
- Joined: Tue Jan 13, 2009 7:33 pm
- Occupation: Student
- Project Question: For the "Measuring Sugar Content of a Liquid with a Laser Pointer" project http://www.sciencebuddies.org/science-f ... p028.shtml, where does equation (1) come from and what is/are a good research source(s) for it
- Project Due Date: Wednesday, January 14, 2009 (TOMORROW!!!!)
- Project Status: I am conducting my research
Keeping L constant...
Wouldn't distant L remain the same no matter how distant x changes?
Last edited by haa12renaissance on Tue Feb 17, 2009 11:39 pm, edited 2 times in total.
-
deleted-2574
- Former Expert
- Posts: 675
- Joined: Thu Feb 03, 2005 3:38 pm
Re: Measuring Sugar Content of a Liquid with a Laser Pointer
Hi haa12renaissance,
Yes, L can be kept constant.
You can reference this site as the Science Buddies "Ask an Expert" bulletin board, https://www.sciencebuddies.org/mentoring/phpBB3/
Yes, L can be kept constant.
You can reference this site as the Science Buddies "Ask an Expert" bulletin board, https://www.sciencebuddies.org/mentoring/phpBB3/
Cheers!
Dave
Dave
-
haa12renaissance
- Posts: 5
- Joined: Tue Jan 13, 2009 7:33 pm
- Occupation: Student
- Project Question: For the "Measuring Sugar Content of a Liquid with a Laser Pointer" project http://www.sciencebuddies.org/science-f ... p028.shtml, where does equation (1) come from and what is/are a good research source(s) for it
- Project Due Date: Wednesday, January 14, 2009 (TOMORROW!!!!)
- Project Status: I am conducting my research
Keeping L constant...
Exactly how would L be kept constant?
Last edited by haa12renaissance on Tue Feb 17, 2009 11:40 pm, edited 1 time in total.
-
haa12renaissance
- Posts: 5
- Joined: Tue Jan 13, 2009 7:33 pm
- Occupation: Student
- Project Question: For the "Measuring Sugar Content of a Liquid with a Laser Pointer" project http://www.sciencebuddies.org/science-f ... p028.shtml, where does equation (1) come from and what is/are a good research source(s) for it
- Project Due Date: Wednesday, January 14, 2009 (TOMORROW!!!!)
- Project Status: I am conducting my research
Keeping L constant...
Exactly how would L be kept constant?
Last edited by haa12renaissance on Tue Feb 17, 2009 11:37 pm, edited 1 time in total.
-
deleted-2574
- Former Expert
- Posts: 675
- Joined: Thu Feb 03, 2005 3:38 pm
Re: Keeping L constant...
Hi haa12renaissance,
If you look at item #5, under Figure 6, the sheet of paper taped to the table under the table, should allow you to keep L constant. An alternative is to keep the distance between the prism and the wall constant (between e and b in Figure 6). It should be easy to accomplish this, by taping paper on the table or measuring the distance and adjusting.
I believe if you follow the above, it will answer your other questions.
If you look at item #5, under Figure 6, the sheet of paper taped to the table under the table, should allow you to keep L constant. An alternative is to keep the distance between the prism and the wall constant (between e and b in Figure 6). It should be easy to accomplish this, by taping paper on the table or measuring the distance and adjusting.
I believe if you follow the above, it will answer your other questions.
Cheers!
Dave
Dave
-
deleted-2574
- Former Expert
- Posts: 675
- Joined: Thu Feb 03, 2005 3:38 pm
Re: Measuring Sugar Content of a Liquid with a Laser Pointer
Hi haa12renaissance,
Ah I missed this first time out: the same question "How do you keep L constant is addressed both here and in the "Keeping L constant..." topic. As you can imagine, a dual posting can lead to confusion and needs to be avoided.
I don't think there was much harm here, but please try to avoid the dual posting in the future. Thanks.
Ah I missed this first time out: the same question "How do you keep L constant is addressed both here and in the "Keeping L constant..." topic. As you can imagine, a dual posting can lead to confusion and needs to be avoided.
I don't think there was much harm here, but please try to avoid the dual posting in the future. Thanks.
Cheers!
Dave
Dave
-
deleted-71447
- Former Expert
- Posts: 1019
- Joined: Fri Oct 28, 2005 11:43 am
- Occupation: Research Hydrologist
- Project Question: n/a
- Project Due Date: n/a
- Project Status: Not applicable
Re: Measuring Sugar Content of a Liquid with a Laser Pointer
Hi haa12renaissance,
I have merged your separate topic about the constant L issue with this thread so that the experts can follow your experiment and questions. As David mentioned, please keep questions related to this project in this topic by use the "Post Reply" button. Thanks!
Chris
I have merged your separate topic about the constant L issue with this thread so that the experts can follow your experiment and questions. As David mentioned, please keep questions related to this project in this topic by use the "Post Reply" button. Thanks!
Chris