Wave – a movement of energy through… …A medium – the matter (solid liquid or gas) the wave...
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Transcript of Wave – a movement of energy through… …A medium – the matter (solid liquid or gas) the wave...
Wave – a movement of energy through……A medium – the matter (solid liquid or gas) the wave moves through…• Mechanical Waves• 1. Transverse Waves
– Ocean / water waves
• 2. Longitudinal Waves– Sound waves
…A vacuum – as in empty space, yes, outer space.
• Electromagnetic Waves– Light– Micro(waves)– Radio– Ultraviolet– Infrared– Gamma– X-rays
• We will talk more about these later….
Take notes!
Transverse Wave - A wave whose medium to move perpendicular to the direction of the wave
Don’t draw, just look
Transverse Wave - A wave whose medium to move perpendicular to the direction of the wave
• Crest = the “top” of the wave• Trough = the “bottom” of the wave. Think farms, pigs
• Amplitude (labeled “a”) = the energy of the wave. – From resting / equilibrium position to crest / trough– NOT CREST TO TROUGH!
DrawTHIS!! Resting / equilibrium
position
Transverse Wave - A wave whose medium to move perpendicular to the direction of the wave
• Wavelength – the length of the wave– Symbol is Greek lowercase lambda – λ – (think upside down “y”)
– Measured in meters – (m)– From crest to crest, trough to trough, or A resting /
equilibrium position to the next full cycle
Don’t Re- draw, but there is new info..
Resting / equilibrium position
Longitudinal Wave - A wave whose medium to move parallel to (in the same as) the direction of the wave
Don’t draw, just look.PPT should show gif.
Longitudinal Wave - A wave whose medium to move parallel to (in the same as) the direction of the wave
Draw This!Make sure your comp. are drawn thick!
• Crest = Compressions• Trough = Rare factions• Amplitude = the energy of the wave. – How tightly packed the compressions are…– Think about squeezing more and more slinky coils
Longitudinal Wave - A wave whose medium to move parallel to (in the same as) the direction of the wave
• Wavelength – the length of the wave– Symbol is Greek lowercase lambda – λ – (think upside down “y”)
– Measured in meters – (m)
– From compression to compression– trough to trough– The beginning/middle/end of any compressions or rarefaction to…– the same or corresponding beg./mid/end of next compression/
rarefaction
Don’t Re- draw, but there is new info..
Period – the amount of time it takes to complete 1 wave or 1 cycle.
• Period is time!• The standard unit is seconds.• The symbol is a capital letter-t: T• Period for a minute is…• T = 60 s• Period for an hour is • T = 3600 s
Frequency– the number of waves or cycles complete in 1 second.
• Just Watch PPT gif of a transverse wave with an increasing frequency.
Frequency– the number of waves or cycles complete in 1 second.
• Units:• # of waves – is not a unit, it’s just a number, like 1• Units: or
Frequency and Periodlook…
Frequency
• They are inverses!!!
P
• Inverse of x equals 1/x
Velocity of a Wave
• • Units: () (∙ m)
• So yes.. Velocity of wave is in (m/s)