2 of 38

Air yang tenang jangan disangka tiada buaya

3 of 38

What happen if you throw a stone into the pond?

4 of 38

Tanya Sama Pokok

5 of 38

Circular wave moving on the water surface

6 of 38

Wave is a disturbance that travels through a medium in a series of oscillations

7 of 38

medium :–

substance or a material which carries the waves from it s source to another location

8 of 38

disturbance

oscillations

medium

source

9 of 38

Energy is transferred along the direction the direction of waves without the medium being transferred

10 of 38

have kinetic energy + potential energy

Water did not move

Gain kinetic energy

11 of 38

Types of Waves

12 of 38

Transverse wave

A wave in which the vibration of particles in the medium is at right angle (perpendicular) to the direction of propagation of the wave

E.g: Water waves

Electromagnetic waves

13 of 38

The particle of the material move up and down along the direction in which the wave is travelling

15 of 38

Longitudinal waves

A wave in which the vibration of particles in the medium is parallel to the direction of propagation of the wave

E.g: sound wave

16 of 38

The particle of the material move backwards and forwards along the direction in which the wave is travelling

18 of 38

Wavefront

An imaginary line that joins all the points on the crest of wave

19 of 38

Direction of motion

20 of 38

The direction of propagation of a wave is perpendicular to its wavefront

21 of 38

Oscillating System

System that undergoes a periodic to and fro movement

23 of 38

Terms

Amplitude – maximum displacement from mean position
Period, T – time taken to complete one oscillation
Frequency, f – number of complete oscillations made in one second
Wavelength – horizontal distance between two successive equivalent points on the wave

24 of 38

Amplitude increase, loudness increase
Frequency increase, pitch increase

26 of 38

Damping (Lembapan)

Occurred in an oscillating system when the system loses energy to the surroundings

28 of 38

Resonance

When an oscillating system is driven at its natural frequency by a periodic force

31 of 38

Displacement-Time Graph

32 of 38

Displacement-Distance Graph

Distance

λ=wavelength

33 of 38

Wave speed, v

recall

v = wave speed

s = distance

t = time

34 of 38

Displacement-Distance Graph

Distance

λ=wavelength

35 of 38

But,

Thus,

T = period

36 of 38

Example 1

Calculate the wave speed if its wavelength and frequency are 3.5 cm and 15 Hz respectively

37 of 38

Example 2

A wave travels with a speed 2.5 x 10⁸ m s^-1.

a. What is the frequency of the wave if its wavelength is 2.7 m?

b. Another wave is travelling with the same speed but has a frequency of 1.0 x 10¹² Hz. What is the wavelength of the wave?

1 of 38