Notes 4: Wave Phenomena

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Notes 4: Wave Phenomena
Name____________________________________
Regents Physics
Date_________________________
Notes: Interference and Diffraction
Interference
Wave Phase
 Wave ________________
is used to compare __________________
on different waves.
2 points
phase
in phase
 On the following wave points A and B are ___________________,
points B and C are
completely out of phase and points C and D are _________________________.
_______________________________
partially in phase
B
A
D
C
Superposition principle – Or Combining Waves
same medium
When two or more waves pass through the ________________________, the displacement at any point in the
sum of displacements by each wave,
medium is the ______________________________
1. Waves that are in phase and have the same frequency.
2. Waves out of phase, same frequency
3.
4. Waves w/ different frequency
Beats
 When two waves with very ____________________________
similar frequencies interfere they produce a new wave with
alternating high and low amplitudes.
 High amplitude is heard as ______________________
and low amplitude as low volume.
high volume
 Sounds like ___________________________
WA – WA – WA – wa – WA –
WA - WA
http://faraday.physics.utoronto.ca/PVB/Harrison/Fl
ash/ClassMechanics/Beats/Beats.html
Diffraction

Bending
The ___________________________
of waves around a corner

Example: hearing sound waves when the sources is ______________________,
around a corner Laser light bending around
a hair.

Opening for waves should be only slightly larger than the
wavelength
_______________ of waves passing through.

crests and
The pattern in the diagram represents wave ____________
troughs or bright and dark wave fronts.
_______________
screen
hair
laser light rays
https://www.youtube.com/watch?v=Iuv6
hY6zsd0
https://www.youtube.com/watch?v=8a61G8Hvi0
Double slit experiment
 When a wave pattern is passed through 2 adjacent slits,
diffraction
____________________ occurs at each slit.
 Alternating constructive and destructive
interference
____________________
results in a projected
dark
___________
and ______________
pattern on a screen.
light
Doppler Effect

Occurs when a wave producing source and an observer are in motion relative to one another.
stationary
 In diagram A above the source of sound is ______________________________
emitted
 Observer A and B both hear the same frequency as the frequency that is ______________
equal
 Note the wavelength is ______________
at all points surrounding the source
the left
 In diagram B above the source of sound is moving to ________________
at constant speed.
 Observer C hears a _______________________
Higher frequency than the source is emitting.
 The wavelength of sound waves the observer C hears is _____________________
shorter
 Observer D hears a ______________________
lower frequencythan the source is emitting.
 The wavelength of sound waves the observer D hears is ____________________
longer
 https://www.youtube.com/watch?v=O5rqMPdQMQ8&list=PL8E31D9BEA1268CE0&index=22
https://www.youtube.com/watch?v=h4OnBYrbCjY

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