Chapter 13 Notes I

• 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