waves 1 - Introduction, What's a wave, sound waves, echolocation

Building on Simple Hamonic Oscillation series #apphysics #wavesounds
What is a wave? Properties of waves. Seismic waves, sound waves, wave on a rope. Echolocation. Easy problems.

References:
https://phet.colorado.edu/sims/html/wave-on-a-string/latest/wave-on-a-string_en.html (sim)
https://www.acs.psu.edu/drussell/demos.html (simulations)
https://manoa.hawaii.edu/exploringourfluidearth/physical/ocean-floor/layers-earth/compare-contrast-connect-seismic-waves-and-determining-earth-s-structure (seismic waves)
https://www.iris.edu/gallery3/general/posters/exploring_earth/WaveIllustration (seismic waves)
https://www.youtube.com/watch?v=VE520z_ugcU (build a wave machine)
https://www.youtube.com/@mrg3/featured (Physics animation)

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