Pendulums

1
wave a regularly repeating pulse
5.1.3 Wave Properties
2
Transverse Wave particles of the medium move
PERPENDICULAR to the waves direction of travel
3
Transverse Wave particles of the medium move
PERPENDICULAR to the waves direction of travel
SLINKY WAVES Faster in SPARSE mediums
4
Longitudinal Wave particles of the medium move
PARALLEL to the waves direction of travel.
5
Longitudinal Wave particles of the medium move
PARALLEL to the waves direction of travel.
SOUND WAVES Faster in DENSE mediums
6
Wave VelocityWaves have a definite direction of
travel.

• Wave period (T) TIME FOR A WAVE TO REPEAT
• Wave frequency (f) NUMBER OF WAVES PER SECOND
• IMPORTANT ONCE A WAVE IS PRODCUED ITS FREQUENCY
  CANNOT BE CHANGED!
• Wavelength (?) DISTANCE FROM CREST TO CREST (OR
  COMPRESSION TO COMPRESSION)

7
A wave with a frequency of 1.5 hertz is moving
through a heavy spring where its wavelength is
2.0 meters.
Examples

• What is the speed of this wave?

• What wavelength would the wave have if it moved
  into a lighter spring where its speed was 6.0
  meters per second?

• What would probably happen to the amplitude of
  this wave after it moves into the lighter spring?

v 3.0 m/s
? 4.0 m
Amplitude would increase
8
Wave PhaseWhat is the direction of motion in the
medium?
v
v
9
Wave PhaseTwo points are considered to be in
phase if they are moving in the same direction
at the same time.
10
Wave PhaseThe number of degrees out of phase
depends on the difference in wavelength between
the points.
0 whole wave 90 1/4 wave 180 1/2 wave
A/D B/E
A/B B/C D/E
A/C C/D E/F
v
A
D
E
B
F
C
11
End of 5.1.3 - PRACTICE