Jan 23, 2016
• Definition: maximum displacement from the
equilibrium position
• How is wavelength related to frequency?
• What does stand for?
• Definition: material through which a wave travels
• What two things does the period of a pendulum
depend on?
•Definition: Number of waves per second
• Definition: wave that travels parallel to the
particles of the medium
• What is the “wave equation”?
• Definition: unit to measure frequency
• Definition: time for one vibration
Demo – tuning fork in water
music box – more vibration, more sound
* Sound is a ________________ waveLONGITUDINAL
compression rarefaction
* Sound needs a ________________ medium
(sound can not travel in a vacuum)
* At room temperature sound travels _______
* Light travels ________________
343 m/s
300,000,000 m/s
You SEE lightning before
You HEAR thunder
* Sound travels faster in _________ air than
_________ air
WARM
COLD
* Sound travels fastest in ___________,
slower in ______________ ,
and slowest in ____________
SOLIDS
LIQUIDS
GASES
The perceived highness
or lowness of a sound, depending
on the frequency of the sound wave
v = f = 343 m/s
Small
Big f
High note
Big
Small f
Low note
the apparent change
in frequency due to the motion of the
wave source
http://www.lon-capa.org/~mmp/applist/doppler/d.htm
Doppler Football
Vsource Vsource < Vwave = 0
Vsource Vsource > Vwave = Vwave
C
C
HIGH FREQUENCY
LOW FREQUENCY
Three waves pass every second. If
the wave speed is 150 m/s, what is
the wavelength?
REVIEW
What is the velocity of this wave if it
takes 1/2 s for each wave to pass?
12 meters
REVIEW
Standing waves are formed on a 18 m rope.
What is the when there is one segment?
3 segments?
4 segments?
6 segments?
REVIEW