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Slide 1
Waves
4th Year
Rowena D. Olicia
CTP-LEAP
Philippines
Slide 2
TARGETS
At the end of the lesson, 75% of the students
should be able to:
Define waves.
Identify the characteristics of wave.
Solve problems on waves.
Slide 3
WAVES
are disturbances that propagate through space
are also called energy carriers
transfer energy from one point to another
do not carry the particle of matter
only cause particle of matter to vibrate / move
back and forth
Slide 4
Parts of Waves
Wavelength
wavelength
Amplitude A
wave crest
distance
amplitude
wave trough
time
Slide 5
Examples of Waves
Water surface waves
Sound
Electromagnetic Waves (EM Waves)
- radio/TV waves, microwave, infrared, visible
light, ultraviolet, X-rays, gamma
Seismic waves
Slide 6
Wave Characteristics
Slide 7
Characteristics of Waves
Frequency f (inverse of period T) number of cycles per
second (Hertz)
T
f=c/
T=1/f
Slide 8
Wavelength (λ)
distance between successive identical parts of
a wave
distance the wave has traveled in one
complete cycle
Slide 9
EM Spectrum
www.andor.com/
Slide 10
Amplitude
Maximum displacement from
the equilibrium (midpoint)
position
Measure of how much energy
the wave has
Slide 11
Frequency (f)
number of waves that pass
a given point per unit of
time
Unit: hertz (Hz)
Slide 12
Period (T)
time for a wave to complete a cycle
reciprocal of frequency
T= 1/f
Wave Speed (v)
speed with which waves pass a particular
point
Wave speed = wavelength / period
v = λ / T or
v = λf
Slide 13
Sample Problems
1)
2)
A vibration of frequency 5Hz sends a wave
of 0.8m down a rope. What is the speed of
the wave?
A wave of wavelength 1.5m travels down a
rope at a speed of 6m/s. What is the
frequency of the wave?
Slide 14
Solutions
1)
Given:
frequency (f) = 5Hz
wavelength (λ) =0.8m
speed (v) =?
Formula:
V =f x
V = 5 Hz x 0.8m
V = 4.0 m/s
Slide 15
2) Given:
velocity (v) = 6m/s
wavelength(λ)= 1.5m
frequency (f) = ?
Formula: f= v/
f= 6m/s
1.5m
f= 4Hz
Slide 16
SUMMARY
I. Waves
disturbances in space/matter
energy carriers
II. Kinds
Mechanical Waves (need a medium)
a. longitudinal (propagation parallel to motion)
ex. sound
b. transverse (propagation perpendicular to motion)
ex. String wave
EM Waves (do not need a medium)
ex. Radio/TV waves, microwave, visible light, UV, X-rays
Slide 17
SUMMARY
III. Wave Characteristics
Wavelength (crest-crest; trough-trough)
Frequency (no. of waves per second)
Amplitude (maximum displacement)
Period (time to complete one cycle)
Wave speed(wavelength over period)
Slide 18
Slide 19
REFERENCES
http://hyperphysics.phy-astr.gsu.edu/hbase/sound/tralon.html
sol.sci.uop.edu/.../chapter10/refraction.jpg
www.gcsescience.com/Transverse-Wave.gif
http://dev.physicslab.org/
http://www.physicsclassroom.com/Class/waves/U10L3c.html
www.fen.upc.edu/
Waves
4th Year
Rowena D. Olicia
CTP-LEAP
Philippines
Slide 2
TARGETS
At the end of the lesson, 75% of the students
should be able to:
Define waves.
Identify the characteristics of wave.
Solve problems on waves.
Slide 3
WAVES
are disturbances that propagate through space
are also called energy carriers
transfer energy from one point to another
do not carry the particle of matter
only cause particle of matter to vibrate / move
back and forth
Slide 4
Parts of Waves
Wavelength
wavelength
Amplitude A
wave crest
distance
amplitude
wave trough
time
Slide 5
Examples of Waves
Water surface waves
Sound
Electromagnetic Waves (EM Waves)
- radio/TV waves, microwave, infrared, visible
light, ultraviolet, X-rays, gamma
Seismic waves
Slide 6
Wave Characteristics
Slide 7
Characteristics of Waves
Frequency f (inverse of period T) number of cycles per
second (Hertz)
T
f=c/
T=1/f
Slide 8
Wavelength (λ)
distance between successive identical parts of
a wave
distance the wave has traveled in one
complete cycle
Slide 9
EM Spectrum
www.andor.com/
Slide 10
Amplitude
Maximum displacement from
the equilibrium (midpoint)
position
Measure of how much energy
the wave has
Slide 11
Frequency (f)
number of waves that pass
a given point per unit of
time
Unit: hertz (Hz)
Slide 12
Period (T)
time for a wave to complete a cycle
reciprocal of frequency
T= 1/f
Wave Speed (v)
speed with which waves pass a particular
point
Wave speed = wavelength / period
v = λ / T or
v = λf
Slide 13
Sample Problems
1)
2)
A vibration of frequency 5Hz sends a wave
of 0.8m down a rope. What is the speed of
the wave?
A wave of wavelength 1.5m travels down a
rope at a speed of 6m/s. What is the
frequency of the wave?
Slide 14
Solutions
1)
Given:
frequency (f) = 5Hz
wavelength (λ) =0.8m
speed (v) =?
Formula:
V =f x
V = 5 Hz x 0.8m
V = 4.0 m/s
Slide 15
2) Given:
velocity (v) = 6m/s
wavelength(λ)= 1.5m
frequency (f) = ?
Formula: f= v/
f= 6m/s
1.5m
f= 4Hz
Slide 16
SUMMARY
I. Waves
disturbances in space/matter
energy carriers
II. Kinds
Mechanical Waves (need a medium)
a. longitudinal (propagation parallel to motion)
ex. sound
b. transverse (propagation perpendicular to motion)
ex. String wave
EM Waves (do not need a medium)
ex. Radio/TV waves, microwave, visible light, UV, X-rays
Slide 17
SUMMARY
III. Wave Characteristics
Wavelength (crest-crest; trough-trough)
Frequency (no. of waves per second)
Amplitude (maximum displacement)
Period (time to complete one cycle)
Wave speed(wavelength over period)
Slide 18
Slide 19
REFERENCES
http://hyperphysics.phy-astr.gsu.edu/hbase/sound/tralon.html
sol.sci.uop.edu/.../chapter10/refraction.jpg
www.gcsescience.com/Transverse-Wave.gif
http://dev.physicslab.org/
http://www.physicsclassroom.com/Class/waves/U10L3c.html
www.fen.upc.edu/