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Madeline Horn edited subsection_Analysis_Error_analysis_The__.tex
over 8 years ago
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\subsection{Analysis}
Error analysis
for Johnson Noise
The discrepancy between our result ($1.46 \pm0.0054 \cdot 10^{-23}\textrm{ m}^2 \textrm{ kg} \textrm{ s}^{-2} \textrm{ K}^{-1}$ and $1.46 \pm0.0052 \cdot 10^{-23} \textrm{ m}^2 \textrm{ kg} \textrm{ s}^{-2} \textrm{ K}^{-1}$) and the accepted Boltzmann constant ($1.38 \cdot 10^{-23} \textrm{ m}^2 \textrm{ kg} \textrm{ s}^{-2} \textrm{ K}^{-1}$)is approximately 5.8\% . Both sets of data we obtained (with a $1\textrm{k}\Omega$ resister and a $10\textrm{k}\Omega$) gave a consistent value for the Boltzmann constant which is a matter of accuracy rather than precision, so this error is most likely a systematic error.
Assuming that our thermometer is accurate (for room temperature), the temperature within the instrument, where the resister is, may be higher. As we can see in
Eq.~ \ref{eq:boltzmann}, equation \ref{eq:Equatoin}, with a higher
$\textrm{T(K)}$, $T$, we would have a lower
$\textrm{K}_\textrm{B}$ $k_b$ value which is opposite to what our value is, so this is unlikely what is causing the error.
The measured
values(\textbf{Table 6 in appendix}) values(Table \ref{table:True_Resistance}) for Rin is about $0.3\%$ different from the claimed value. Rin is also not the main source of error.
$\Delta{f}$? $V^2$? Unfortunately, we only took one error value for all of the Johnson data. We found that the average error for the $1 \Omega$ resistor was $0.003 \textrm{Volts}^2$. Because we did not take any other error data, it is impossible to find the total error in our measurements.