TERM 4 SUMMATIVE PRACTICAL ASSESSMENT_2
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P
HYSICS
for GRADE 11
Term 4 / SY 2012 - 2013
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SUMMATIVE PRACTICAL EXAMINATION
Wave Optics: Diffraction
Aim:
To determine the slit width (d) of a diffraction grating using different monochromatic light.
Main Concept
F
X2
X1
or
constructive interference:
If θ is very small:
D
Materials:
Ray Box Diffraction Grating
Ruler Light filter
Graph Paper Focusing Lens
Experimental Set-up:
Procedure: Write at least 6 important procedure in the experiment [3 marks]
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Variables:
Identify the INDEPENDENT Variable [1 mark]
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Identify the DEPENDENT Variable [1 mark]
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Identify TWO CONTROLLED Variables [1 mark]
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Data Presentation:
Complete the table. [4 marks]
1 mark for complete correct readings/measurements taken (all measurements and data must have correct significant figures)
1 mark for a complete correct data for the column n × λ × D
1 mark for a complete correct data for the column total uncertainty error
1 mark for a complete correct data for the column uncertainty error of d
Light |
λ |
n |
D
unit: _____
(± ______) |
% uncertainty error of D
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n × λ × D
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x
unit: _____
(± ______) |
% uncertainty error of x
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Total Uncertainty Error (% uncertainty error of D + % uncertainty error of x) |
d
unit: ____ |
UNCERTAINTY ERROR of d (d ± total % uncertainty error) |
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Red |
650 nm |
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Green |
510 nm |
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Blue |
475 nm |
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Data Processing: Show complete calculations. [3 marks]
Calculations for Red Light (λ = 650 nm)
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(1 mark)
Calculations for Green Light (λ = 510 nm)
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Calculations for Blue Light (λ = 475 nm)
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(1 mark)
Graphical Representation of Results:
Plot the graph nλD (y-axis) against x (x-axis). All points correctly plotted. [2 marks]
Graph correctly labeled with units. [1 mark]
Graph with sensible scale. [1 mark]
Line of best fit properly drawn. [1 mark]
Evidence of measurement and calculation of the slope. [3 marks]
2 marks for measurements
1 mark for calculation
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Graph Analysis:
Compare the average value of d to the calculated slope of the graph.
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Conclusion of Results: [1 mark]
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Improvement. Name something that would improvement the accuracy of the experiment other than darkening the room. [1 mark]
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- END OF EXAMINATION -