In an experiment to verify Boyle’s law, a student took the set of readings given in the table below - Leaving Cert Physics - Question 2 - 2013
Question 2
In an experiment to verify Boyle’s law, a student took the set of readings given in the table below.
| X | 120 | 160 | 200 | 240 | 280 | 320 |
|-------|-----|--... show full transcript
Worked Solution & Example Answer:In an experiment to verify Boyle’s law, a student took the set of readings given in the table below - Leaving Cert Physics - Question 2 - 2013
Step 1
What physical quantities do X and Y represent?
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Answer
X represents pressure, and Y represents volume. These quantities are essential in Boyle's law, which relates pressure and volume of a gas at constant temperature.
Step 2
Name the units used when measuring these quantities.
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Answer
The standard SI unit for pressure (X) is Newton per square meter (N/m²) or Pascals (Pa). The unit for volume (Y) is typically cubic meters (m³) or liters (L).
Step 3
Draw a labelled diagram of the apparatus that the student used in the experiment.
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The apparatus includes a container with graduations, a gas pressure gauge, and a piston (or other mechanism) for adjusting pressure and volume. The diagram should clearly label these components.
Step 4
Describe the procedure he used to obtain these readings.
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Answer
The student could have followed these steps:
Set up the apparatus with the gas in the container and the piston positioned at a known volume.
Measure the initial volume and pressure using the gauge.
Gradually adjust the piston to change the volume while observing the corresponding change in pressure.
Record the pressure and volume for various positions of the piston, ensuring each reading is noted at a consistent point.
Step 5
Use the data in the table to draw an appropriate graph on graph paper.
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To create the graph:
Plot pressure (1/Y) on the y-axis against volume (X) on the x-axis.
Make sure to correctly label the axes and include the appropriate units.
Plot the points based on the inverse relationship shown in the data.
Ensure that the points are plotted accurately for a clear representation.
Step 6
Explain how your graph verifies Boyle’s law.
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Answer
The graph should show a straight line through the origin when plotting pressure against the inverse of volume, indicating that pressure is inversely proportional to volume (P ∝ 1/V) at constant temperature. This confirms Boyle's law, illustrating that as volume increases, pressure decreases.
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