physics/ fizik =

MAKLUMAN

2010-11-03T10:30:00.000+08:00

Salam,

Please proceed to my others Physics Blogs

1. http://f5y09smsl1.blogspot.com/

2. http://rohitfiles.blogspot.com/

TQ

SPM 2009: 4531/ 1/ Jawapan

2009-12-20T22:34:00.002+08:00

1.C 2.D 3.A 4.B 5.A 6.B 7.C 8.C 9.A 10.D

11.A 12.B 13.C 14.C 15.A 16.A 17.B 18.B 19.C 20.B

21.B 22.A 23.D 24.D 25.C 26.D 27.D 28.B 29.C 30.B

31.B 32.C 33.B 34.C 35.C 36.B 37.C 38.A 39.C 40.D

41.B 42.C 43.C 44.B 45.B 46.A 47.C 48.B 49.B 50.D

**Not sure if the answers are correct.

Physics Principle

2009-10-15T07:15:00.000+08:00

Salam Aidil Fitri 09

2009-09-18T14:34:00.019+08:00

SELAMAT HARI RAYA AIDIL FITRI 2009
"Ulangkaji Fizik jangan dilupakan"

Finish syllabus

2009-07-13T14:01:00.000+08:00

Has finish Form 5 syllabus today (13 July 09)
Will concentrate on revision & drill exercise.

New weblog for form4 revision

2009-06-16T11:51:00.000+08:00

http://f5y09smsl1.blogspot.com/

By SM Sains Labuan Form5 students
TQ

Concept map - Transistor

2009-05-13T10:23:00.000+08:00

Concept map - Diode as rectifier

2009-04-15T07:00:00.001+08:00

Concept map: 2.8

2009-04-08T10:53:00.000+08:00

2.8

Doping

2009-03-28T10:35:00.000+08:00

Doping is a process of adding a certain amount of specific impurities to semiconductors to increase their conductivity
Two types of doping:

p-type semiconductors
n-type semiconductors

p-type semiconductors

1. Si (pure/ intrinsic semiconductor) have valency of 4

2. Al (impurity) have four e valens

3. When Al is added to Si, there will be one less e - p-type semiconductor is produced
4. No. of e > No. of holes

n-type semiconductors
1. Si (pure/ intrinsic semiconductor) have valency of 4

2. P (impurity) have three e valens

3. When P is added to Si, there will be one extra e - n-type semiconductor is produced

4. No. of holes > No. of e

Diode Semiconductor

2009-03-24T20:12:00.000+08:00

9.2 Understanding Diode Semiconductor

Solids: Conductor VS Semiconductor VS Insulator

Conductor: Have free electrons that can drift between their atoms
Semiconductor: Have electrons and holes
Insulator: Don't have free electron

Additional information: Energy bands for solids

The conductivity of semiconductors also can be increased by

rising the temperature
shining light on it
adding impurities to it (doping)

ANALYSIS {PHYSICS F5}: MARCH TEST 09

2009-03-24T20:08:00.001+08:00

Sila klik pada gambar ini:
TQ.

ANALYSIS {PHYSICS}: SPM 2008

2009-03-24T19:59:00.000+08:00

Sila klik pada gambar ini.

TQ.

CRO5

2009-03-23T08:05:00.000+08:00

Application of CRO

1. Display the wave forms of voltage

2. Measuring the potential difference (a.c & d.c)

3. Measure a short time of duration/ interval

CRO4

2009-03-23T07:30:00.000+08:00

The Cathode Ray Oscilloscope (CRO)

Three parts of the CRO:
1. Electron gun

Filament: Is heated when current flows through it. It is used to heat up the cathode.
Cathode: Heated cathode emits electrons through the process of thermionic emissions.
Control grid: Control the number of electrons in the electron beams.
The more negative the grid, the fewer the electrons are emitted from the electron gun and the less the brightness of the bright spot on the screen.
Focusing anode: To focus the electrons into a beam and to attract electrons from the area of the control grid.
Accelerating anode: To accelerate the electron beam towards the screen.

2. Deflection system

The deflection system allows the electron beam to be deflected from its straight-line path when it leaves the electron gun.
Y-plates is to move the electron beam vertically up and down the screen when an input voltage is applied across it.

3. Fluorescent screen

Application of CRO

Measuring potential difference
Measuring short intervals
Displaying wave forms

CRO3

2009-03-13T07:08:00.000+08:00

9.1 Understanding the uses of the Cathode Ray Oscilloscope

Properties of cathode rays

CRO2

2009-03-06T07:23:00.000+08:00

9.1 Understanding the uses of the Cathode Ray Oscilloscope

Thermionic emission

Factors affecting the rate of thermionic emission

Surface area of metal - Directly proportional
Temperature of metal - Directly proportional
Types of metal - Depends of the metal type
Nature of metal surface - Will increase the acceleration of the electrons

Cathode rays

Thermionic emissions can be used to produce a continuous flow of electrons in a cathode ray tube.
The beam of electrons moving from cathode to anode is called cathode ray.

CRO1

2009-03-05T09:22:00.000+08:00

9.1 Understanding the uses of the Cathode Ray Oscilloscope

Thermionic emission

1. A metal surface has many free electrons

2. When it is heated to certain temperature, some of the electrons have gained enough kinetic energy to break free and escape to surroundings.

3. This effect is known as thermionic emission.

March Test 2009

2009-03-03T13:00:00.000+08:00

Friday/ 6.50 - 8.20 a.m

Form 5: Paper 3 (4531/3)
Form 4:

4S/ P/ C - Ch. 1 - Ch. 2 (2.4)
4I - Paper 3 (4531/3/ Section A)

Be READY !!!