Facts about Waves

1. Waves transfer energy without transfering the matter.
2. Transverse wave's particles vibrate perpendicular to the wave direction.
3. Longitudinal wave's particles vibrate parallel to the wave direction.
4. The amplitude of a wave determines its energy.
5. Higher amplitude has greater energy.
6. Damping of wave causes decrease in amplitude & energy.
7. Waves' wavefront is always pependicular to the direction of the waves.
8. Waves undergo all of these phenomena; reflection, refraction, diffraction &
interference.
9. Water,light & electromagnetic waves are transverse waves.
10.Coherent waves have same frequency & in phase.
11.As the frequency of a wave increases its energy increases and its wavelength
decreases.
12.Shorter waves with higher frequencies have shorter periods.


Facts about Light Wave

1. Light is a transverse wave
2. Light slows down, bends toward the normal and has a shorter wavelength when it
enters a higher refractive index(n).
3. Medium with higher refractive index has higher optical density.
At the critical angle a light wave will be refracted to 90 degrees.
Blue light has more energy,a shorter wavelength and a higher frequency than red
light (remember- ROYGBIV).
4. Monochromatic light has one color, frequency & wavelength.

Facts about water waves

1. Water waves moves faster at deeper region. This change in speed causes refraction
of water waves.
2. Water waves has longer wavelength at deeper region.
3. Deeper region is less dense than shallow region.
4. Water waves bended towards normal as it moves from deeper to shallow region.
5. After diffraction, water waves amplitude decrease thus its energy decrease as
well.However its speed, wavelength & frequency remain constant.

Facts about sound waves

1. Sound is a longitudinal waves.
2. Sound is produced through vibration, thus compressing & stretching the
surrounding air molecules.
3. Louder sound has bigger amplitude.
4. Sound with high pitch has higher frequency.
5. The sound that we hear is known as 'audio sound' that has freuency between 20-20
khz.
6. Those sound below 20hz is known as infrasound. While sound with frequency beyond
20khz is known as ultrasonic.
7. Sound require medium to travel. It travels fastest in solid> liquid> gas.
Sound can't be heard in vacuum
Therefore..Starwars' sound effect in outer space is a myth :)

Form 4 Post mortem

Salam Semua.....

Welcome to the month of February , the month with shortest no.of days but lots of public holidays :) [ Hari Wilayah (1st Feb) ,chinese new yr(14-15 Feb) & maulidur rasul (26 Feb)]. This is the month where teachers gonna be strugling to cope with their lesson plan as scheduled. By the way, i'm not gonna discuss about the lesson plan.
I will start my discussion with a simple question to all SPM candidates:
How many hours did u spend to revise form 4 chapters in a week ???

If your aswer is NO & have done nothing on form 4 so far, i think u need to reorganise your study plan. I believe most of u have forgotten most of the important physics facts in form4. If u dont have proper form4 revision plan.. u'll forget lots of things.

Ok some of them argued that their brilliant classmates dont need to revise them every week. Well i asked them back, ..Do u think they were telling u the truth??? Do u really know what these 'A' students are doin at home?? Anyway..ask your self again..Do your brain processor work as fast as their 'pentium dual core processor'??? If the answer is NO, then u better slap your face NOW, before its too late!

For this reason i'm asking for those who hardly pass their physics to at least consistently revise form4 topics in a week. For me, if u spend only an hour for form4 topics in a week wont be enough.WHy??..coz u have 3 physics papers to answer in SPM. Each paper will test u any form4 chapters.

For example in paper 3 section B, u will be given an option to design only one form4 experiment.
Let say U might have learned more than 15 experiments in form4. Out of all these experiments only 1 will come out in the exam...so the probability is roughly about 1 out of 15. None of us know which one will come out..Each experiment requires u to memorise the diagram, list of apparatus, procedure..and so on. ..I'm only talking about physics paper3, tak campur other papers as well...
On top of that..u have at least another 8 to 10 subjects plus form 5 topics to deal with. By the way,I think its time for u to do a post mortem on all form 4 chapters!!!
Otherwise, if u dont prepare from now...
Do u think u can understand & memorise all of those form4 topics just 3 months before 'trial' or 'SPM'???