information without a net motion of the
medium through which the# travel%
The# involve vibrations !oscillations$ of
some sort%
information without a net motion of the
medium through which the# travel%
The# involve vibrations !oscillations$ of
some sort%
and traditional'''
 
book before ne.t lesson?
that is moving together !in phase$%
/ wavefront
transfer%
direction of energ# transfer%
1irection of energ# transfer 
energ# transfer %
This measures the change that has taken place as a
result of a wave passing a particular point%
6ero displacement refers to the average position%
/ displacement
mean position%
oscillation% 8t is also the time taken for a
complete wave to pass a given point%
One complete wave
:easured in (ert"%
are in phase !points moving together or >in
step$%
wavelength
a stationar# observer% ,,< m%s-*
 
each other 
the period T% 8n this time@ the wave will have
moved one wavelength =%
v / =3T / f= 2ets tr# some
5uestions
 
1) A water wave has a frequency of 2Hz and a wavelength of 0.3m. How fast is it moving?
2) A water wave travels through a ond with a seed of 1m!s and a frequency of "Hz. #hat is the wavelength of the waves?
3) $he seed of sound is 330m!s %in air). #hen &ave hears this sound his ear vi'rates ((0 times a second. #hat was the wavelength of the sound?
) *urle light has a wavelength of around (+10,-m and a frequency of "+101Hz. #hat is the seed of urle light?
ome e.ample wave e5uation 5uestions
0.2m
0."m
0.(m!s
.ample
 A stone is thrown onto still water and creates a wave% A small cork
floating *%< m awa# has the following displacement time graph !time
is measured from when the stone hits the water$
a% What is the amplitude?
b% What is the speed?
c% What is the fre5uenc#?
d% What is the wavelength?
1isplacement cm
Time s
.ample
 A stone is thrown onto still water and creates a wave% A small cork
floating *%< m awa# has the following displacement time graph !time
is measured from when the stone hits the water$
a% What is the amplitude?
) cm
.ample
 A stone is thrown onto still water and creates a wave% A small cork
floating *%< m awa# has the following displacement time graph !time
is measured from when the stone hits the water$
b% What is the speed?
 / d3t / *3*%; / <%+ m3s
.ample
 A stone is thrown onto still water and creates a wave% A small cork
floating *%< m awa# has the following displacement time graph !time
is measured from when the stone hits the water$
c% What is the fre5uenc#?
f / *3T / *3<%, / ,%,, ("
.ample
 A stone is thrown onto still water and creates a wave% A small cork
floating *%< m awa# has the following displacement time graph !time
is measured from when the stone hits the water$
d% What is the wavelength?
= / v3f / <%+3,%,, / <%) m