17.3 Behaviors of Waves Reflection Refraction Diffraction

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Presentation transcript:

17.3 Behaviors of Waves Reflection Refraction Diffraction Constructive Interference Destructive Interference Standing Waves

Reflection When a wave _______ _____a surface that it cannot pass through Ex. – ball can’t pass through a wall, so it bounces off Reflection _____ ____change the speed or frequency of a wave, but the wave can be flipped upside down Fixed boundary  reflected wave upside down

Refraction The _______ of a wave as it enters a new medium at ___ _______. Occurs when a wave enters __ _________at an angle One side of the wave moves more slowly than the other side Refraction applet In this case, v = different refractive value for a different medium

Diffraction PhET diffraction applet The bending of a wave as it moves _______ an obstacle or ________ ________a narrow opening A wave diffracts more if its wavelength is ______ compared to the size of an opening or obstacle If wavelength < opening/obstacle, then very little bending If wavelength > opening/obstacle, then larger bending

Interference When __ __ ______waves overlap and combine together 2 types of interference ___________ (leads to increased amplitude) ____________ (leads to decreased amplitude)

Constructive interference When 2 or more waves combine to produce a wave with a ______ displacement (amplitude)

Destructive Interference When 2 or more waves combine to produce a wave with a ______displacement (amplitude)

Standing Waves A wave that appears to _____ __ __ ______– it does not seem to move through the medium Examples – plucked guitar string or elastic cord ______ = a stationary point on a standing wave Complete destructive interference between incoming and reflected waves _________ = a point where a crest or trough occurs midway between nodes Forms _____ ___a wavelength or a multiple of half a wavelength fits exactly into the length of a vibrating cord.

Standing Waves Links to Standing Waves Applets Standing wave created by reflecting off of 1 barrier http://faraday.physics.utoronto.ca/IYearLab/Intros/StandingWaves/Flash/reflect.html Standing wave created by reflecting off 2 barriers http://faraday.physics.utoronto.ca/IYearLab/Intros/StandingWaves/Flash/standwave.html