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A student carried out an experiment to obtain the calibration curve of a thermometer - Leaving Cert Physics - Question 3 - 2007
Question 3
A student carried out an experiment to obtain the calibration curve of a thermometer. The following is an extract from her report. I placed the thermometer I was ca... show full transcript
Worked Solution & Example Answer:A student carried out an experiment to obtain the calibration curve of a thermometer - Leaving Cert Physics - Question 3 - 2007
Step 1
Draw a labelled diagram of the apparatus used in the experiment.
Answer
To accurately depict the apparatus used in the experiment, include the following components in the diagram:
- Beaker of Water: Represented as a rectangle or a container.
- Mercury Thermometer: Draw this with a visible scale and bulb, indicating it's used as the standard.
- Non-Calibrated Thermometer: Similar to the mercury thermometer but can be differentiated (e.g., different color or labeling).
- Heat Source: Include a symbol for a Bunsen burner or hot plate below the beaker.
- Stirring Mechanism: You may indicate a stirrer to improve temperature uniformity.
- Labeling: Clearly label each component with lines or arrows pointing to them.
Step 2
Using the data in the table, draw a graph on graph paper of the value of the thermometric property against its temperature.
Answer
To graph the values provided in the table, follow these steps:
-
Axes: Draw two perpendicular lines to create the X and Y axes.
- The X-axis should represent temperature (°C), ranging from 0 to 100.
- The Y-axis should represent the thermometric property, ranging from 0 to 150.
-
Plot Points: Mark the following points based on the data:
- (0, 4)
- (20, 12)
- (40, 24)
- (60, 40)
- (80, 64)
- (100, 150)
-
Connect Points: Smoothly connect the marked data points to form a curve, ensuring it reflects any appropriate trends observed in the data.
Step 3
Use your graph to estimate the temperature when the value of the thermometric property is 50.
Answer
Based on the drawn graph:
- Locate the point where the thermometric property equals 50 on the Y-axis.
- Draw a horizontal line until it intersects with the curve you plotted.
- From this intersection point, draw a vertical line down to the X-axis. The value where this line intersects the X-axis indicates the estimated temperature.
From the graph, we estimate that when the thermometric property is 50, the temperature is approximately between 68°C and 72°C.
Step 4
Step 5
How was the value of this thermometric property measured?
Answer
The value of the thermometric property (such as voltage in a thermocouple) is usually measured using an ohmmeter or other relevant measuring instruments. These devices convert the property into a readable format that can be easily interpreted by the user.