PHYSICAL SCIENCES Grade 11 TERM 2 RESOURCE PACK
[Pages:96]PHYSICAL SCIENCES Grade 11
TERM 2
RESOURCE
PACK
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Contents
Worksheets
3
Topic 5: Geometrical Optics
4
Topic 6: 2D and 3D Wavefronts
19
Topic 7: Ideal Gases and Thermal Properties
27
Topic 8: Quantitative Aspects of Chemical Change
36
Formal Experiment: Intermolecular Forces
43
Technical Instructions
44
Learner's Worksheet
50
Marking Guidelines
58
Assessments63
Topic 5: Geometrical Optics
64
Topic 6: 2D and 3D Wavefronts
74
Topic 7: Ideal Gases and Thermal Properties
83
Topic 8: Quantitative Aspects of Chemical Change
91
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WORKSHEETS
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RESOURCE PACK
Topic 5: Geometrical Optics
WORKSHEET
MULTIPLE CHOICE 1. Consider light travelling in air towards an air/water boundary, as shown in the diagram
below. Which of the following best describes the reflected ray 2?
air water
i1 i2
Ray 2
i3
Ray 3
A No light will be reflected, so ray 2 does not exist. B Some light will be reflected and i1 = i2 . C All light will be reflected and i1 > i2 . D Some light will be reflected and i1 < i2 . (2)
2. Consider the situation shown in Q1, above. Which of the following would best describe the situation with the refracted ray and the angle of refraction, i3 ?
A i1 = i3 .
B i1 > i3 .
C i1 < i3 .
D No light will be refracted as it is all reflected.
(2)
LONG QUESTIONS 3. Light is going from an insect into water, as shown in the diagram below.
air
water
3.1. Define the term `refraction'.
4Grade 11 Physical Sciences
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(2)
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WORKSHEETS
TOPIC 5: GEOMETRICAL OPTICS
3.2. Why does the light ray change direction?
(1)
3.3. In which direction does the light ray bend?
(1)
3.4. Copy and complete the ray diagram to show how the ray of light reaches the
fish's eye.
(3)
3.5. Where would the insect appear as seen by the fish? Show the position of the
fish on your diagram.
(2)
3.6. A friend says that light always travels in straight lines. How would you respond to
her/him?
(2)
4. Complete the following ray diagram to illustrate the path of the light.
Include the following labels in your sketch:
incident ray, emergent ray, refracted ray, normal lines, angles of incidence and
refraction and angle of deviation.
(9)
TOPIC 5
5. Consider a ray of light entering a semi-circular glass block, as shown below.
5.1. Copy and complete the following ray diagram:
(2)
Glass block
O
5.2. Which medium has a higher optical density; the glass or the air?
(1)
5.3. The ray does not bend when it enters the semi-circular block.
What does this tell you about the angle of incidence? Explain your answer. (3)
What does this tell you about point O?
(1)
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RESOURCE PACK
6. In the diagram below (not to scale), a ray of light, is travelling from glass towards the boundary with ice.
Ice n =1,31
Glass n =1,52 21?
6.1. The angle on incidence is 21?. Copy and complete the ray diagram for the ray
at the boundary of the glass and ice.
(3)
6.2. Write down the equation for Snell's Law.
(1)
6.3. Calculate the critical angle for light going from glass into ice.
(3)
6.4. How does the speed of light in the glass compare to speed of light in ice?
(2)
7. In an experiment, light goes from air to diamond. The angle of incidence is 21? and the angle of refraction is 60?.
7.1. State Snell's law.
(2)
7.2. The refractive index for air is 1,00. Calculate the refractive index for
this diamond.
(4)
7.3. Calculate the speed of light in diamond.
(3)
8. 8.1 What two criteria are needed for total internal reflection to occur?
(2)
8.2. Explain how an optical fibre uses total internal reflection.
(2)
8.3. Give two practical uses for optical fibres.
(2)
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WORKSHEETS
TOPIC 5
TOPIC 5: GEOMETRICAL OPTICS
9. Consider a ray of light travelling through water into olive oil and then into air, as shown in the diagram below. Air n =1,0
Olive Oil n =1,47
Water n =1,33
9.1. Redraw and complete the path of the ray through the three mediums.
(4)
9.2. Explain why the ray changes direction as it goes from the water into the olive oil. (2)
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RESOURCE PACK
CONSOLIDATION EXERCISE
TOTAL: 54 MARKS
MGRUALDTEIP11LETECRMHO2 IWCOERKSHEET
1. Light goes from air into a glass circular prism (as shown below), at 90? to the surface of
QUtEhSeTIpOrNism9 . Which of the following best describes and explains the path of the ray inside the prism?
90?
PATH OF THE RAY
EXPLANATION
A
Light bends towards the normal
The glass is optically more dense than the air.
B
Light bends away from the normal
The glass is optically more dense than the air.
C
Light does not bend
The ray is travelling along the normal.
D
Light does not bend
CONSOLIDATION QUESTIONS
The air and the glass have the same optical density.
QU ESTION 2 (2)
2. A light ray travels from medium P to medium Q. Medium Q has a lower refractive index than medium P. The critical angle for this situation is 40?. Which one of the following sketches represents the correct path of the ray?
(2)
8Grade 11 Physical Sciences
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