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| -rw-r--r-- | faraday_prelab.tex | 17 |
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diff --git a/faraday_prelab.tex b/faraday_prelab.tex index dd9f1d7..d20324d 100644 --- a/faraday_prelab.tex +++ b/faraday_prelab.tex @@ -36,15 +36,26 @@ Using Eq.(2) roughly estimate the value of the expected rotation angle for $B\ap Examine Eq.(4) to find the value of the angle $\theta$ that will provide maximum useful signal for measuring $\phi$. -Hint: If you are having trouble, try this: for each of the angles in +Hint 1: Every time I hear maximum or minimum, I think about derivatives. + +Hint 2: If you are having trouble, try this: for each of the angles in question 1 compute the numerical value of the two terms in equation 4, assuming $I_0=1.0$, and your value of $\phi$ from part 2. Is the intensity $I$ in equation 4 sensitive to the value of $\phi$ for each of those angles? Compute for other angles of your choice. How do we adjust $\theta$ to maximize the useful signal? -\section*{4. Error analysis} -In this experiment you will be determining the error in the amplitude of an oscillating signal using its digitized form, recorded by an oscilloscope. A sample yellow trace, shown in Fig.(3), depicts the change in the signal voltage as a function of time. What would be a good measure of the uncertainty in its amplitude for such a measurement? +\section*{4. The source of polarization} + +The previous questions assumed that there are two polarizers in the system. +But, figure 2 in the manual shows only one. This experiment cannot work +with just one polarizer. So, where is the other one? + +Hint: read the lab manual carefully. + + +% \section*{5. Error analysis} +% In this experiment you will be determining the error in the amplitude of an oscillating signal using its digitized form, recorded by an oscilloscope. A sample yellow trace, shown in Fig.(3), depicts the change in the signal voltage as a function of time. What would be a good measure of the uncertainty in its amplitude for such a measurement? |