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Wave – a movement of energy through…

Wave – a movement of energy through…. Take notes!. …A medium – the matter (solid liquid or gas) the wave moves through…. …A vacuum – as in empty space, yes, outer space. Electromagnetic Waves Light Micro(waves) Radio Ultraviolet Infrared Gamma X-rays

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Wave – a movement of energy through…

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  1. Wave – a movement of energy through… Take notes! …A medium – the matter (solid liquid or gas) the wave moves through… …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…. • Mechanical Waves • 1. Transverse Waves • Ocean / water waves • 2. Longitudinal Waves • Sound waves

  2. Transverse Wave - A wave whose medium to move perpendicular to the direction of the wave Don’t draw, just look

  3. Transverse Wave - A wave whose medium to move perpendicular to the direction of the wave Draw THIS!! Resting / equilibrium position • 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!

  4. Transverse Wave - A wave whose medium to move perpendicular to the direction of the wave Don’t Re- draw, but there is new info.. Resting / equilibrium position • 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

  5. 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.

  6. 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

  7. Longitudinal Wave - A wave whose medium to move parallel to (in the same as) the direction of the wave Don’t Re- draw, but there is new info.. • 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

  8. 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

  9. Frequency– the number of waves or cycles complete in 1 second. • Just Watch PPT gif of a transverse wave with an increasingfrequency.

  10. 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

  11. Frequency and Periodlook… Frequency P Inverse of x equals 1/x • They are inverses!!!

  12. Velocity of a Wave • Units: () ∙ (m) • So yes.. Velocity of wave is in (m/s)

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