SPM Physics:Radioactive

I personally belived that this final chapter of form 5 is much easier than chapter 3. All u need is to do lots of reading plus some memorizing stuff. Ok, whats important in this chapter?

First of all make sure u know the structure of an atom & how to write its nuclide notation. Then u must be able to define the following:
Radioactivity?
Radioactivve decay?
Radioisotope?
Half life??..(ops not the one u played in the video game)
Do i need to provide the definition..well,i dont think so, coz its all in your book. Take it out and memorise them b4 your trial exam..

Next what's important??
If u understood the concept of radioactivity..there are 3 common type of radiation that we learned in SPM. They are alpha particle, beta particle& gamma ray. You must be able to identify which detector can be used to detect these radiation. Besides that, for each radiation, u need to memorise and differentiate their characteristic such as:
1. its nature,e.g alpha exist as helium nucleus with nuclide notation He4/2
2. penetrating power
3. ionising power
4. track pattern in cloud chamber.
5. effect of electric field
6. effect of magnetic field
Again i will not elaborate further coz its all in your book. If u dont read then u have a hard time to memorize them. However i 'm providing u with some useful videos from the net.. so u can get clearer picture about alpha, beta & gamma.

Are you studying last minute??

According to Charles Law,under constant volume when the temperature of the gas increase..its PRESSURE increases as well. The higher the temperature, the higher the pressure.

Yeah the hypothesis is so true epecially when we 're moving towards August 2010...The temperature is rising, day by day..& most of the form5 students are started to feel the heat. To make it worst..the PRESSURE is mounting as high as mount Everest . One of my student said.."Sir, i rasa nak muntah everytime nak revise..so many things to cover.sejarah lah..add maths, chem,bio..not to mention physics..
I answered her.."well thats the price for studying last minute :) " So if u are a form4 who accidentally reads this post...i hope u'll make a better preparation for 2011.

So the big question mark now is how to study last minute??? Is it possible to get good marks??
For me its very subjective, it depends very much on how u handle the mounting pressure. I even had a student who fainted after knowing a BAD trial results..coz if u did it badly in trial, u have about a month to recover. It sounds so frightening right ;) but some of u couldnt be bothered coz at the moment they have this 'tak apa' attitude.

Let's imagine that u are watching a football match. There's only 5 minutes left before referee blow the final whistle. Suddenly u can see players of both team are so energetic. They start to work as a team.. chasing and passing the ball accurately. They are very focused & determined to get the winning goal. Finally the ball touches one of the net in a dying moment and a group of players chasing the goal scorer. Meanwhile the other team lie down on a grass with despair. It all happened in a very last minute of the game..

anyway ..Is it possible to 'score' if we study last minute??

If u analyse the football match.. One team managed to do it and the other one has failed.The same results goes to last minute study.
So if u are doing last minute revision, make sure u stay focus & keep your mind in a positive mode.
Having study group also will help..as in a football match, u'll work better if u help each other. In football the coach helps them to set things right and for u guidance from teacher/tutor will be helpful..but its all rely on how good u are in handling the situation. The main principle for effective last minute study is to leave everything behind and set your study as your only priority. You can leave your problems with your friends, family and even forget about you don't even have a time to 'FACEBOOK' and play PS2. In the end, if u think positive..u can definitely make it!
Here some interesting tips for those 'last minute' students

SPM Physics: Logic gates

Yesterday i teach one of my weakest student logic gates concept. She is the type who has problem to understand physics concept properly. Somehow, when i showed her a concept of logic gates, she tends to be addicted doing logic gates exercises... This shows that she is actually good in logical thinking.

Logic gates is actually a very simple concept learned in Electronics. In fact i can say that it is one of the easiest subtopic provided if u are able to think 'LOGIC' :)
However u need to understand the following basic logic gates i.e NOT,AND,OR,NAND and NOR.
U must be able to construct the truth tables for those gates. Truth table helps us to undderstand the behavior of the logic gates. In other words, it shows how the input of a logic gates relate to its output.

Usually students are a bit blurred on this topic coz they wondered what is actually '1' or '0' means?
keep in mind most of computerised devices work on electrical flow where a HIGH voltage is considered as '1' and LOW voltage as '0'. Logically, it is sorts of a switching system which requires some inputs in order to produce an output.

In SPM, u need to practise lots of paper2 questions on application of logic gates. Usually the question can be tricky..so u must really understand the condition explained in the application.
When actually they apply this logic gate concept??

Well i can give u a simple example.. if u used to wash your clothes using washing machine..we can create a LOGIC input for the machine which looks like this:
to rotate the motor, we need to fill in the water untill to a certain level. Once the water rises to that level..the input will be '1'... but some how it still not rotated...kenapa ya? Ops, may be you lupa nak tutup the 'top cover'. Here where the logic gates play its role..the rotating motor represents the output which depends on the input of the water level & the 'top cover' position. So it needs both input to be '1', then baru dia rotate..
Thus we can use AND gate in this application.

National Physics Competition 2010

Seramai 15 orang pelajar SMKA Sharifah Rodziah telah mengambil bahagian dalam National Physics Competition 2010 anjuran Institut Fizik Malaysia. Para peserta dikehendaki menjawab 70 soalan objektif dalam masa 2 jam 30 minit. Aras kesukaran soalan adalah tinggi dan merangkumi sukatan pelajaran fizik SPM.

Tarikh Pertandingan: 29 Julai 2010, Khamis

Masa: 9.00 hingga 11.30 pg

Tempat: Bilik Mesyuarat Assaiyyidah Hjh. Pauziah

Di bawah ialah gambar-gambar peserta semasa pertandingan tersebut.

Semoga semua peserta berjaya mencapai tahap CEMERLANG.

SPM PHYSICS

Girls!!, if you like to know more about Topic 8 (ELECTROMAGNETISM) and other topics also, do not hasitate to click the link below:
http://www.physics4spm.com/search/label/3.1%20Analysing%20Electromagnet

10.2 Radioactive decay

1. Radioactivity is he spontaneous and radom disintegration of unstable nucleus to become more stable nucleus by emitting energetic particle and photon
2. Disintegration of unstable nucleus also known as decay.
3. The process is said to be spontaneous because it is not triggered by any external factors like temperature and pressure.
4. Which and when the nucleus will decay is unpredictable and uncontrollable. That's why this process is a random process.
5. There are three types of radioactive emission. They are alpha particle, beta perticle and gamma-ray. The nature and characteristics of the emission are tabulated below:

Topic 10 RADIOACTIVITY

There are several subtopic under the main topic Radioactivity. Let me list down all the subtopic first:
10.1 The nucleus of an atom and the structure of atom.
10.2 Radioactive decay
10.3 Radioactive detectors
10.4 Half-Life of radioactive source
10.5 Radioisotopes
10.6 Nuclear energy
10.7 Management of radioactive substances

10.1 The nucleus of an atom
In this sub-topic student should know how to:
a) describe the composition of the nucleus of an atom in terms of protons and neutrons,
b) define proton number (A) and nucleon number (Z)
c) use the nuclide notation
d) define the term isotope

For this subtopic what you have learn in Chemistry is applicable here so all you have to do is answer all questions in the module given.

I will continue with sub-topic 10.2

Physics
SPM
Transistor as Control Switch

Today i'm going to continue our discussion about light control switch by using transistor & LDR.Before we go further, firstly u must understand the characteristic of LDR?LDR is a type of resistor known as Light Dependent Resistor which is very sensitive towards light.Important point about LDR that u MUST remember:In a BRIGHT condition, its resistance DECREASE.In a DARK condition, its resistance INCREASE.Now lets have a look at the circuit below, describe what happen at NIGHT???

At night,

LDR's resistance increase much higher than the fixed resistor,
A higher voltage is supplied across the LDR,
This increases the flow of base current and switch ON the transistor,
The bulb lights up
So what if we want to switch ON the bulb in the morning & close it at night?Its simple, u just need to change the position between the LDR & the 10k fixed resistor.The same concept applies in Heat Control switch, except instead of using LDR we use THERMISTOR.Again, its important for u to memorise the chracteristic of a thermistor, i.e; at HIGH temperature - Resistance DECREASE, at LOW temperature - Resistance INCREASE

TOPIC 8 FORM 5 : ELECTROMAGNETISM

To know more about Topic 8 (ELECTROMAGNETISM) you may click the link below:
http://www.physics4spm.com/search/label/3.1%20Analysing%20Electromagnet

Laman Web skoool.co.uk

Please click the link below to learn Physics Form 4 and Form 5 interactively.
Happy learning!!!!!!!!!

http://segfl.skoool.co.uk/keystage3.aspx?id=93#1_12

SPM FORM 5 PHYSICS



Cathode Ray Oscilloscope (C.R.O)

To understand this topic, u must understand the following definition:
Themionic emission: - the release of electrons from a heated metal cathode
From the process of thermionic emission, we can produce cathode ray... By the way, what is chathode ray??
Cathode ray defined as a beam of electrons moving at high speed in a vacuum.
This cathode ray concept is widely used in making TV. In SPM, we apply its concept in understanding the uses of Cathode Ray Oscilloscope.

Before applying CRO, u must understand the properties of the cathode ray itself. Make sure u hafal all those properties such as:
-moving in straight line
-negatively charged
-deflected by electric & magnetic field and etc.

Once u've understood & investigated all the properties..then lets have a look at the structure of the device called CRO:
Like it or not this chapter requires u to hafal all those structure of CRO. Besides that, u need also to memorise their function as they might be asked in the exam.
Then, u must understand the working principle of CRO and how to calculate the voltage + frequency of a waveform.

To calculate the voltage & frequency, u must understand to use 2 important button in CRO, i.e
'Y-Gain' & 'Time base'