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Experiment [2i Auenuation @ Gamma Particles Frocedure Attenuation of Gamma rays by Aluminum and Mylar: In this experiment; You will calculate the linear attenuation...

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Experiment [2i Auenuation @ Gamma Particles Frocedure Attenuation of Gamma rays by Aluminum and Mylar: In this experiment; You will calculate the linear attenuation constant for Aluminum and Mylar: Procedure: Place the Cs-137 source about 3 cm below the detector: Find the number of counts for 10 You should get 1100 counts for micro-Curie (pCi) sources and 6000 for LCi sources Repeat more times Find the average count (No, no absorber between the source and the detector) . Aluminum: Cut the Al-foi

Experiment [2i Auenuation @ Gamma Particles Frocedure Attenuation of Gamma rays by Aluminum and Mylar: In this experiment; You will calculate the linear attenuation constant for Aluminum and Mylar: Procedure: Place the Cs-137 source about 3 cm below the detector: Find the number of counts for 10 You should get 1100 counts for micro-Curie (pCi) sources and 6000 for LCi sources Repeat more times Find the average count (No, no absorber between the source and the detector) . Aluminum: Cut the Al-foil into [" x 2" strips. You may need 10-[4 strips The instructor will let you know the thickness of the Al-foil. Place 2 strips on the source_ Find the counts for I0 sec Repeat more times Find the average of the trials: Add 2 more strips for total of' 4. Repeat step Find the counts for total of 10-12 strips_ Draw graph of N versus tOtal Lhickness ol Aluminum (incm): This graph will show exponential decay (similar to capacitor discharge). Draw graph of In (NINo) versus This will be straight line. Find theslope_from linear fit to thedata: 10, The slope is the linear attenuation constant & (in units ofcm"') Mylar Repeat above steps (1-10) for Mylar: Find &from data analysis: 139



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In developing night-vision equipment, you need to measure the work function for a metal surface, so you perform a photoelectric-effect experiment. You measure the stopping potential $V_{0}$ as a function of the wavelength $\lambda$ of the light that is incident on the surface. You get the results in the table. $$ \begin{array}{l|llllll} \boldsymbol{\lambda}(\mathbf{n m}) & 100 & 120 & 140 & 160 & 180 & 200 \\ \hline \boldsymbol{V}_{0}(\mathbf{V}) & 7.53 & 5.59 & 3.98 & 2.92 & 2.06 & 1.43 \end{array} $$ In your analysis, you use $c=2.998 \times 10^{8} \mathrm{~m} / \mathrm{s}$ and $e=1.602 \times 10^{-19} \mathrm{C}$ which are values obtained in other experiments. (a) Select a way to plot your results so that the data points fall close to a straight line. Using that plot, find the slope and $y$ -intercept of the best-fit straight line to the data. (b) Use the results of part (a) to calculate Planck's constant $h$ (as a test of your data) and the work function (in eV) of the surface. (c) What is the longest wavelength of light that will produce photoelectrons from this surface? (d) What wavelength of light is required to produce photoelectrons with kinetic energy $10.0 \mathrm{eV} ?$


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