Wave Motion
Definitions
Propagationof energy without the necessary
displacement of matter
It is a mechanism to transmit energy from one
point to another
Vibrational Motion
Type of Waves
Typesaccording to Medium
Mechanical Waves – wave energy needs a
physical medium (air, liquid, solid) to
propagate itself.
Examples: sound ( air), earthquake ( solid and
liquid),
5.
Electromagnetic Waves– wave energy which
does not require any physical medium.
Example: Light, and the different frequencies
of light
Radio waves, gamma rays, x-rays, visible light,
ultraviolet rays, microwaves.
6.
Types of Wavesaccording to direction of
vibration
Transverse wave
- The direction of energy is perpendicular to the
direction of wave motion (vibration)
Parts, and Propertiesof a Wave
Transverse Wave
Trough
Crest
Nodes
Wavelength
Length of one cycle
Amplitude – distance
From equilibrium to max displacement
13.
Frequency (f) –the number of cycles or
vibrations per second. (Hertz)
Velocity – the speed of the wave
Period (T) – the time required to make one
vibration( 1/f)
14.
Frequency, Velocity, andWavelength
F – frequency
V – velocity
- wavelength
T - period
T
v
fv
15.
Parts for LongitudinalWaves
Compression – particles are compressed near a
point
Rarefaction – particles are spaced wide apart
from one another.
16.
Quiz
Answer the following:
Trueor False
1) In order for a sound to travel from Joseph to
Martin, the air molecules near Joseph’s lips
must travel to the ears of Martin.
2) A transverse wave transmits energy from east
to west, the particles of the medium will
move also from east to west.
17.
• 3. Whenthe fans in a basketball game makes
this movement, this is an example of
Longitudinal wave.
• 4. When fans in a basketball game makes this
movement, this is an example of transverse
wave.
• 5. Sonar sound is used to map the bottom of a
sea floor and to locate fish. Sonar is an
example of transverse wave
18.
Multiple Choice
6. Thisletter represents the wavelength
7. This letter represents the amplitude.
8. This letter represents the trough.
9. This letter represents the crest.
F
G