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Waves and Waves and InterferenceInterferenceWaves and Waves and
InterferenceInterference
Transverse & Longitudinal Transverse & Longitudinal WavesWaves
Transverse Waves• A person shakes the free end of a
rope up & down.
• The wave moves to the right.• The motion of the rope is at
RIGHT ANGLES to the direction in which the wave is moving.
• This is a transverse wave.– Eg: Strings in musical instruments,
– Waves in a stadium.
T
Longitudinal Waves• Sometimes the medium and the
wave move in the same direction (parallel).
• These are longitudinal waves.• Ex: Sound waves.
compressioncompression
rarefactionrarefaction
Identify the wave:Transverse wave – Spring is moved
up & down
Longitudinal Wave - Spring is moved
in and out
Interferences• Occur when 2 waves pass through each
other.• 2 types of interference:• 1) Constructive Inference:
2 Crests that pass through each other make a BIGGER wave.
2) Destructive Interference:2 Waves that pass through each
other make a SMALLER wave.
Interference
Constructive Interference
Destructive Interference
crest to crest adds to amplitude
crest to trough reduces amplitude
Lab on Waves• Move into groups of 4 ONLY.• DO NOT TANGLE THE SLINKIES.• DO NOT STRETCH the slinkies too
much.
DebriefPart I – Longitudinal Waves
• In which direction do the pieces of string move as the wave moves through the slinky?Part II – Transverse Waves
• In which direction do the pieces of string move as the wave moves through the slinky?
2. What will happen to the frequency, period and wavelength if you shake the spring faster?
• Frequency –• Period –• Wavelength –
Part III - Interference• Step 2 – Constructive Interference• Step 3 - Destructive Interference