User:Randy Jay Lafler/Notebook/Physics 307L/2010/10/18: Difference between revisions
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{{SJK Comment|l=05:29, 21 December 2010 (EST)|c=Very nice primary lab notebook and great job taking data.}} | |||
=Speed of Light= | =Speed of Light= | ||
The purpose through the setup as well as the Excel sheet and graphs are the same as in [http://openwetware.org/wiki/User:Emran_M._Qassem/Notebook/Physics_307L/2010/10/18 Emran's notebook] | The purpose through the setup as well as the Excel sheet and graphs are the same as in [http://openwetware.org/wiki/User:Emran_M._Qassem/Notebook/Physics_307L/2010/10/18 Emran's notebook] |
Revision as of 03:29, 21 December 2010
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SJK 05:29, 21 December 2010 (EST)
Speed of LightThe purpose through the setup as well as the Excel sheet and graphs are the same as in Emran's notebook PurposeTo measure the speed of light by using a T-A converter and an oscilloscope. Equipment
Safety
Setup
Procedure
DataAnalysisThe accepted value for the speed of light is 30cm/ns. We got a value of 31.5(1)cm/ns for the first trial, SJK 05:28, 21 December 2010 (EST) and we obtained a value of 32.1(19)cm/ns for the second trial. These values are both larger than the accepted value for the speed of light. The accepted value is a little more than one standard diviation smaller for both of our measurements. Even though our values for the speed of light are both larger than the accepted value, they seem to be consistent with each other. The range for our first data is 30.5cm/nm to 32.5 cm/nm, and the range for our second data set is 30.2cm/nm to 34cm/nm. So, the ranges for our data do overlap.ErrorThe accepted value of C:
Since both our data sets are larger than the accepted value by a similar amount, it is possible we had some systematic error in our measurements. Other possible error could be do to us not holding the intensity of the light completely constant. We had to turn the PMT within the tube to maintain the spike measured by the oscilloscope at the same level, and thereby keep the intensity the same. We had to do this by matching the side of the spike to the cursor line on the oscilloscope, and the spike was very sensitive at close distances to turning the PMT. I have more explanation for the error in my summary. Error in Summary Acknowledgments/CitationsEmran for the picture's, Excel sheet and graphs. |