Guidelines Superposition 1, 2.1, 2.2, 2.4

Section 1: Principle of Superposition
Key Definition: What is the principle of superposition?
[All the diagrams are just illustrations]

Section 2.1
What is the conditions for the formation of stationary waves?

Section 2.2
- What is a node/antinode?
- [no sign of progressive wave is kind of obvious]
- how do you determine the wavelength of a stationary wave?
- how do particles behave in between two nodes?
- When is the amplitude maximum? Zero?
- [the part about equal segments is also obvious]
- How do particles on the left of a node compare to particles on the right of the same node?

Section 2.4
- What is an example of stationary transverse waves?
- How is a stationary wave set up in the string?
- What are the boundary conditions for a vibrating string?
- What is fundamental frequency?
- [Ignore the statement that says that "A harmonic is a note whose frequency...". We have decided to discourage the use of the word "harmonic", as it means different things in Physics and in Music terminology. Instead, use the word "mode"]
- Can you sketch the lowest 3 modes of the vibrating string?
- Can you determine the wavelength of these 3 modes?

Guidelines: Waves Section 4, 3.1

Sorry for being late in posting this. I've been busy making the e-Learning Lesson (you guys will get to download it soon).

Section 4
What kind of waves can be polarized?
What is an unpolarized wave like?
What is a polarized wave like?
How do you polarize an EM wave?
If you have two polariods, when do you get maximum intensity? minimum intensity?
What are some sources of unpolarized light?
How much intensity is blocked when light gets polarized?

The notes did not mention what is a source of polarized waves (other than passing light through a polaroid). One source of polarized EM waves is a radial antenna. For an idea of how a radial antenna transmit polarized EM waves, you can check out this simulation.

Some sunglasses are polarizers. How could you find out if your sunglasses polarize light?

Section 3.1
What is the vertical axis of a CRO?
What is the horizontal axis?

Questions to attempt for tutorial
Bond & Hughs, Chp 10 Pg 11, Q 1, 2, 3
Pg 13, Q 1, 2

Notes Guidelines Section 1.3 (Energy Transfer)

- [The first three points are either not important or repeated]
- Key Formula: E α f²A²
- (P α f²A²)
- (I α f²A²)
- [This is actually just one formula, not three. E, P and I are all proportional to f²A². However, you do need to know the relationship between E, P and I.]
- P = E/t
- I = P/Area
- What is the inverse square law, and when do you apply it?
- [Note: the inverse square law doesn't just apply to Intensity. It similarly applies to Power and Energy as well.]

Guidelines for Making notes (Section 2.1 and 2.2)

By now I have assigned all my classes (except for the Advanced Learners) to make notes for sections 2, 2.1 and 2.2. Below are some hints to help you with your note making:

Section 2
- What is a transverse wave?
- [The two main types of transverse waves are not necessary. However, you do need to have some general idea what the EM waves are, and that they are transverse waves]
- What is a longitudinal wave?

Section 2.1
- How do the particles move in a transverse wave?
- What is a crest? A trough?
- [Point 3,4,5,6,7 are repeat concepts of what has been covered earlier in section 1.2. However, read them first to make sure that you have already covered that concept earlier]
- How do you determine the direction of particle movement?
- What does the displacement-position graph describe?
- [Everything on Oscillation belongs to the previous Unit and not here. Make notes only if you feel this is necessary to help you understand waves]

Section 2.2
- How do the particles move in a longitudinal wave?
- [all the diagrams are illustrations of longitudinal waves. Draw them only if you feel they help you understand and remember this concept]
- What is a compression?
- What is a rarefaction?
- How do you measure wavelength in a longitudinal wave?
- [Point 8: the two kinds of amplitude is not important]
- How do you sketch a displacement-position graph for longitudinal waves?

By the way, the sub-heading for Section 1.1, 1.2 and 2.3 is "Properties of Progressive Waves"
The sub-heading for Section 2, 2.1 and 2.2 is "Transverse and Longitudinal Waves".

Or whatever sub-headings you so please. This is just a suggestion. You know what? I want you to come up with your own sub-headings. If you copy my sub-headings I will scold you. I want to force you to be creative. Muahahaha. =P