COM Pre Lab and Evaluation

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COM Pre Lab and Evaluation


Student's name ______________________________________________________________


Partner's Name ______________________________________________________________


Pre-lab Discussion Questions

It is your responsibility to discuss this lab with an instructor before your first day of your scheduled lab period. This signed sheet must be included as the first page of your report. Without it you will lose grade points. You should be prepared to discuss at least the following before you come to lab:

  1. What is Compton scattering? How does the Compton formula relate to a laboratory experiment?
  2. To get an idea of the maximum Compton energy shift for the 59.54 keV photons from the 241Am source, calculate the energy shift for a back-scattered photon off of a free electron.
  3. Calculate the energy shift for a back-scattered photon off of an aluminum nucleus. How does this compare to the shift from scattering off of an electron?
  4. What is a scattering cross-section? How does the Klein-Nishina formula relate to a laboratory experiment?
  5. Use the (classical) Thomson total cross section for scattering to estimate the probability of scattering off of a nucleus compared to the probability of scattering off of an electron. [See Melissinos for information on the Thomson cross-section and cross sections in general.]
  6. By what means does the CdTe detector detect photons? (Photoelectric effect? Compton scattering? Pair production? Bremstrahlung?)


Staff Signature ______________________________________________ Date ____________

Completed on the first day of lab? (circle) Yes / No

Mid-lab Questions

On day 5 of this lab, you should have produced a plot of scattered peak energies versus scattering angle, and made an estimate of the electron mass. Show them to a GSI and ask for a signature.


Staff Signature ______________________________________________ Date ____________

Completed by the fifth day of lab? (circle) Yes / No


INCLUDE THIS SHEET AS THE FIRST PAGE OF YOUR REPORT


Physics 111 Advanced Lab Student Evaluation of Experiment

Now that you have completed this experiment, we would appreciate your comments. Please take a few moments to answer the questions below, and feel free to add any other comments. Since you have just finished the experiment it is your critique that will be the most helpful. Your thoughts and suggestions will help to change the lab and improve the experiments. Please be as specific as possible, using both sides of the paper as needed, and turn this in with your report. Thank you!

Experiment name:____________________________________________ Date: ________________________

How was the write-up for this experiment? How could it be improved?




How easily did you get started with the experiment? What sources of information were most/least helpful in getting started? Were the reprints appropriate? Did the Pre-lab discussion help? Did you need to go outside the course materials for assistance? What additional materials could you have used?




What did you like and/or dislike about the experiment?





Did you like the WIKI or does it need improvement? How?





Would you recommend this lab to fellow student? Why or why not?





What advice would you give to a friend just starting this experiment?





Did you get this write up from the 111-Lab WEB site or a copy. ____________________________

How would you rate the Physics 111- Lab WEB sites? (1 = poor; 5 = good.)

1 2 3 4 5

Comments:




Please circle the abbreviations of the other labs you have done. Overall quality of this experiment?
ATM BMC BRA COM CO2 GMA HAL 1 2 3 4 5
HOL JOS LIF LLS MNO MOT MUO Poor Average Good
NMR NLD OPT OTZ RUT SHE XRA

Thank you from the 111-Lab Staff

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