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The sinusoidal graph shown is a graph of displacement, s against time , t of a load on a spring.

O is called the equilibrium position.

From a displacement-time graph for a wave, we can obtain

i) amplitude, a ,and

ii) period, T.

From a displacement- distance graph for a wave, we can obtain

i) amplitude, a ,and

ii) wavelength, λ

The speed of a wave is determined by its wavelength, λ, and its frequency, f , according ti the equation

For a wave moving at constant speed, increasing the frequency will result in a decrease in the wavelength.

For a wave moving at constant speed, decreasing the frequency will result in an increase in the wavelength.

Work example:

What is the frequency of water waves with the wavelength of 3.0 cm and traveling at a speed of 1.5 cm/s ?

solution :

Step 1: write formula first

V= f λ

step 2 : Substitute all given info into formula

1.5 cm/s = f x 3.0 cm

Step 3:find unknown

f = 0.5 Hz

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## Friday, December 31, 2010

## Wednesday, December 22, 2010

### Reflection of waves

occurs when a wave strikes an obstacle. The wave

The phenomenon of reflection of waves obeys the Law of reflection where:

Characteristics of reflection of waves:

Application of reflection of waves:

Fishing with sonar

__undergoes a change in direction of propagation__when it is reflected.The phenomenon of reflection of waves obeys the Law of reflection where:

- The angle of reflection is
~~not~~__equal__to the angle of incidence. - The incident wave, the reflected wave and normal lie
__in the same plane__which is perpendicular to the reflecting surface at the point of incidence.

Characteristics of reflection of waves:

- The wavelength , speed and frequency of the reflected waves is the same as that of the incidence.
- Angle of incidence = angle of reflection.
- Direction of propagation of wave changes.

Application of reflection of waves:

- Radar system
- Makeup mirror
- Car rear mirror and side mirror for your safety .
- Optical fibre
- Ultrasonic
- Fishing with sonar.
- Seawall to deflected the energy of the waves from the coast.

Seawall

Fishing with sonar

## Monday, December 20, 2010

### Displacement- Time graph and displacement -Distance Graph for a wave

The sinusoidal graph shown is a graph of displacement, s against time , t of a load on a spring.

O is called the equilibrium position.

From a displacement-time graph for a wave, we can obtain

i) amplitude, a ,and

ii) period, T.

From a displacement- distance graph for a wave, we can obtain

i) amplitude, a ,and

ii) wavelength, λ

The speed of a wave is determined by its wavelength, λ, and its frequency, f , according ti the equation

__V= f λ__

For a wave moving at constant speed, increasing the frequency will result in a decrease in the wavelength.

For a wave moving at constant speed, decreasing the frequency will result in an increase in the wavelength.

Work example:

What is the frequency of water waves with the wavelength of 3.0 cm and traveling at a speed of 1.5 cm/s ?

solution :

Step 1: write formula first

V= f λ

step 2 : Substitute all given info into formula

1.5 cm/s = f x 3.0 cm

Step 3:find unknown

f = 0.5 Hz

Labels:
displacement,
graph,
time,
waves

## Wednesday, December 8, 2010

### Wave Properties

In merupakan bab pertama dalam syllabus tingkatan 5. Murid 5 UM dan 5UKM anda diminta membuat kuiz yang disediakan. Sebarang pertanyaan boleh ditulis pada Cbox atau hantar ke Facebook saya.

1. Waves are produced by vibrating systems.

2. Waves transfer energy. Waves that travel through a medium

3. In transverse waves, the direction of waves propagation

Example: water waves, light waves and electromagnetic waves.

4. In longitudinal waves, the direction of wave propagation

Longitudinal waves

Example: a sound wave.

5. A wavefront is an imaginary line representing all parts of a wave in which particles are vibrating in the same phase and have the same distance from the source.

The direction of propagation of waves is always

6. Amplitude, a, is the

7. Period, T, is the

8. Frequency, f, is the

9. Wavelength, is defined as the distance between two consecutive points that are in phase.

( i ) For a transverse wave, wavelength can be measured as the distance from one crest and also the distance from one trough to the next trough.

(ii ) For a longitudinal wave, wavelength can be measured as the distance between

two consecutive compressions or two consecutive rarefactions.

1. Waves are produced by vibrating systems.

Vibrating systems

2. Waves transfer energy. Waves that travel through a medium

__transfer energy without transferring matter.__3. In transverse waves, the direction of waves propagation

__is perpendicular__to the direction of vibration of the particles.Example: water waves, light waves and electromagnetic waves.

4. In longitudinal waves, the direction of wave propagation

__is parallel to the direction of vibration of the particles.__Longitudinal waves

__need a medium to propagate.__This type of waves cannot propagate through a vacuum.Example: a sound wave.

5. A wavefront is an imaginary line representing all parts of a wave in which particles are vibrating in the same phase and have the same distance from the source.

The direction of propagation of waves is always

__perpendicular to the wavefront.__6. Amplitude, a, is the

__maximum displacement from the equilibrium position.__7. Period, T, is the

__time required to make one complete oscillation.__8. Frequency, f, is the

__number of complete oscillations made in one second.__9. Wavelength, is defined as the distance between two consecutive points that are in phase.

( i ) For a transverse wave, wavelength can be measured as the distance from one crest and also the distance from one trough to the next trough.

(ii ) For a longitudinal wave, wavelength can be measured as the distance between

two consecutive compressions or two consecutive rarefactions.

Labels:
physics,
properties,
SPM,
waves

## Friday, December 3, 2010

### Gred SPM mulai 2009

Berikut merupakan gred SPM yang mula diperkenalkan mulai 2009.

*SPM Candidates All the Best*!