Download - G10 Waves P1
Waves
Keith Warne
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Transverse Pulse• A pulse is a ……….
……………….. in a
medium.
• A transverse pulse has the
disturbance at …………
to the direction of
movement.
• The pulse shownmoves
from left to right across
the medium.
• The particles of the
medium move UP and
DOWN.
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Transverse Pulse
• The pulse length () would be from the …………. to the …………………………...
• The amplitude (A) is the ……………………… from position of ………...
…………………………..
……………………………
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Longitudinal Pulse
Longitudinal Pulse The disturbance is in the ……………………… as
the wave motion.
The particles vibrate………………………to the wave's velocity.
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Displacement - time
• Draw graphs of transverse position (y) vs time vs t, for a particle of a string or spring as a pulse move past it.
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Displacement - time
• Draw graphs of transverse position (y) vs time vs t,
for a particle of a string or spring as a pulse move
past it.
Time (s)
+
-
y
y
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Displacement - time
• Draw graphs of transverse position (y)
vs time vs t, for a particle of a string or
spring as a pulse move past it.
Time (s)
+
-
y
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Graphs of motion
• Graphs of transverse position (y) vs time (y vs t) and velocity vs time (v vs t) , for a particle of
a string or spring as a pulse moves past it.
Time (s)
+
-
y
Time (s)
+
y
-
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Reflection of Pulses
• …………………. takes place at a fixed end.
• ……………………takes place at a free end.
Fixed end Free end
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Vibrations• Equilibrium position – B
• Points of maximum displacement. A & C
• Amplitude = distance from …………… position to point of …………….. displacement.
• One full vibration.
………………………..
• Period (T) - time taken for onefull vibration. (s)
• Frequency (f) - number of full vibrations in one second. (Hz -vib/s)
Vibrating Stick
A
B
C
period = …………………………
frequency =……………
……………
T = ….
….
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Pendulum• Velocity -time and
acceleration time graphs for a pendulum motion.
• Indicate the points A, B and C on these graphs.
Time (s)
Time (s)
Time (s)
A
BC
If a pendulum completes 12 full cycles in
3s. Calculate:
frequency = ………………………
period = …………………………..
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Transverse Waves
Transverse Waves
The disturbance is at 90o to the direction
of movement.
The particles vibrate perpendicular to the
wave's velocity.
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Frequency. waves
time
= 1.5wvs/1sec
= 1.5 Hz
Period. T = time/waves
= 1 second/1.5waves
= 0.66 s/wv
Amplitude = 0.04m
Transverse Wave
One second
ƒ=
4 cm
One
waveHalf
wave
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Longitudinal Waves
……….………
…………………
A Longitudinal wave is a series of ……………………….. and
………………………………… that move through a medium.
The DISTURBANCE is in the ……………………………….. as the
direction of the wave (pulse).
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Speed of the wave.
• Symbol (“…….”) - the ……………moved by any pulse in one ……………...
• Units meters per second(……….).
Speed = ………… x ……………….
= … x ….
= ………………
= ………. ……..
Transverse Wave - speed
One second
= 5.5mm
= ƒ x
1/2
f = waves
time=
1.5
1= 1.5 Hz
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Comparison
wavelength
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Interference 1
c) The pulses continue on their original
paths.
When two pulses arrive at the
same point at the same time
they combine into a single
pulse with …………… the
amplitude.
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Interference 1
Constructive Interference
• When a pulse and
another pulse meet at a
point
• Displacements add up
• A antinode (point of
double displacement) is
produced.
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Double Source interference
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Double slit interference
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Standing WavesFundamental
frequecy fo
f2 = ….. fo
f 3= ……fo
f4 = ….. fo
f5 = …… fo
fn = ….. fo
= 2 L
= ……L
= ……L
= ……L
= ……L
= ……L
L
…..
…..
……
….
……
……
L = ………
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Properties of waves• Reflection - waves
bouncing off a surface
• Refraction - waves bending as they pass through a different medium.
• Interference - waves interfering as they pass through another wave.
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Reflection• Waves ……….
(bounce) off the surface of objects in their paths.
• The angle that waves are ………. (hit) the surface is the same as that with which they ……….off again.
Angle of incidence
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Refraction of waves• Waves ……………on
entering a more dense
medium.
• If a wave strikes this
medium at an
……………it then
changes direction.
Normal line
90° to the
surface
The wave bends …………………… the normal on entering a more dense
medium at an angle.
The waves bend ………………. ……………… the normal when exiting a
more dense medium.
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Hi -
This is a SAMPLE presentation only.
My FULL presentations, which contain a lot more more slides and other resources, are freely
available on my resource sharing website:
www.warnescience.net(click on link or logo)
Have a look and enjoy!
WarneScience