Experimental physics histogram problem

In summary, the conversation discusses an experiment that generated a histogram with 853 counts in one bin and 2,439 counts in another bin. The speaker is interested in estimating the experimental uncertainty in the measured number of counts for each bin and is seeking advice on where to start.
  • #1
Ertosthnes
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Homework Statement



You have run an experiment and generated a histogram. Suppose you had 853 counts in the bin centered at 1.60, and 2,439 counts in the bin centered at 1.85. If you were to repeat this experiment (by measuring the same source for the same time period, delta t) you know that you would measure a somewhat different number of counts in each of these two bins.

Estimate the experimental uncertainty in the measured number of counts for each of these two bins. In other words, estimate how much your measured number of counts (853 or 2,439) might differ from the true average number of counts in each bin.

Homework Equations


I don't know what the relevant equation is... I guess that's part of the problem.

The Attempt at a Solution


I don't know where to start with this, any help or advice you can give me is very welcome.
 
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  • #2
Solved it, never mind.
 
  • #3


I understand that experimental uncertainty is an inherent aspect of any measurement and it is important to quantify this uncertainty in order to accurately interpret the results of an experiment. In this case, the uncertainty in the measured number of counts for each bin can be estimated using statistical methods.

One approach is to calculate the standard error of the mean, which is a measure of the variation of the data around the true average. This can be calculated using the formula:

Standard error = standard deviation / √(n)

Where n is the number of measurements. In this case, n would be the number of times the experiment is repeated, which is not specified in the homework statement. However, assuming that the experiment is repeated multiple times, the standard error can be used to estimate the uncertainty in the measured number of counts.

Another approach is to use confidence intervals, which provide a range of values within which the true average is likely to fall. The width of the confidence interval can be used as an estimate of the uncertainty in the measurement.

It is also important to consider any sources of systematic error in the experiment, which can affect the accuracy of the measurements. These can be identified and minimized through careful experimental design and control.

In summary, the uncertainty in the measured number of counts for each bin can be estimated using statistical methods such as standard error or confidence intervals, taking into account both random and systematic errors in the experiment.
 

FAQ: Experimental physics histogram problem

1. What is a histogram in experimental physics?

A histogram is a graphical representation of data collected from an experiment. It is a type of bar graph that displays the frequency of occurrence of different values in a data set.

2. How is a histogram used in experimental physics?

In experimental physics, histograms are used to visually analyze and interpret data. They can help identify patterns or trends, as well as outliers or anomalies in the data.

3. What is the purpose of binning in a histogram?

Binning is the process of dividing the range of values in a data set into smaller, equal-sized intervals or bins. This allows for a more detailed analysis of the data and helps to smooth out any fluctuations or noise.

4. How do you determine the appropriate number of bins for a histogram?

The number of bins used in a histogram can vary depending on the data set and the desired level of detail. One method for determining the appropriate number of bins is the Square Root Rule, which suggests taking the square root of the total number of data points in the set.

5. What are some potential sources of error when creating a histogram in experimental physics?

Potential sources of error in creating a histogram include incorrect bin sizes, misinterpretation of data, and biases in data collection. It is important for scientists to carefully analyze and verify their data before creating a histogram to ensure accurate results.

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