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AQA GCSE · Question 01.3 · Waves
Figure 2 shows some of the results from the investigation. Table 2 shows additional results. Complete Figure 2. You should:
• plot the results from Table 2
• draw the line of best fit.
Table 2:
Angle of incidence (degrees): 70, 80
Angle of refraction (degrees): 35, 37
Figure 2 shows some of the results from the investigation. Table 2 shows additional results. Complete Figure 2. You should:
• plot the results from Table 2
• draw the line of best fit.
Table 2:
Angle of incidence (degrees): 70, 80
Angle of refraction (degrees): 35, 37
How to approach this question
1. Locate the x-value (angle of incidence) for the first point from Table 2 on the horizontal axis.
2. Locate the y-value (angle of refraction) on the vertical axis.
3. Mark the point where these two values intersect with a cross (x).
4. Repeat for the second point.
5. Draw a single, smooth curve that passes as close as possible to all the points. It should not be a "dot-to-dot" line.
Full Answer
The two points (70, 35) and (80, 37) should be plotted accurately on the graph. A smooth curve of best fit should be drawn that passes through or close to all the data points, including the new ones.
Plotting the points requires finding the correct coordinates on the graph. For (70, 35), find 70 on the x-axis and 35 on the y-axis and mark the intersection. Do the same for (80, 37).
The line of best fit should be a smooth curve that goes through the origin (since an angle of incidence of 0° would give an angle of refraction of 0°) and follows the trend of the points, with roughly an equal number of points on either side of the line.
Common mistakes
✗ Plotting points inaccurately.\n✗ Joining the dots with straight lines instead of drawing a smooth curve of best fit.\n✗ Drawing a straight line of best fit when the data clearly shows a curve.\n✗ The curve not passing through the origin.
Practice the full AQA GCSE Physics Higher Tier Paper 2
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