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Published byAbner Gibbs Modified over 8 years ago
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Waves Rhythmic disturbance that carries energy through matter or space
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Types of Waves Transverse- wave travels perpendicular to motion of the disturbance
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Types of Waves Longitudinal- wave travels in the same direction or parallel to the direction of the disturbance
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Electromagnetic Waves Do not need a medium to travel All travel at the speed of light c = 3.0 x 10 8 m/s
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Properties Wavelength (λ) - the distance between 2 identical spots on a wave Amplitude- from equilibrium to crest or trough Crests- highest point Troughs- lowest point Period (T)- time (s) measured for one wavelength Frequency (Hz)- # of complete oscillations in one second
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Wave Velocity v = λf f = 1/T
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Practice Problems A wave has a frequency of 262 Hz and a wavelength of 1.29 m. What is the speed of the wave? How long will it take the wave to travel 91.4 m? What is the period of the wave?
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The frequency of violet light is 7.5 x 10 14 hertz. What is its wavelength? What is its period?
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A wave with a wavelength of 2.5 meters travels through a certain point 6 times per second. What is the velocity of the wave?
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Wave Behavior Waves can cross mediums at a boundary Incident wave- strikes the boundary Reflected wave- returning wave When the wave hits the boundary, some energy is reflected back as it moves into the new medium
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Interference Two or more waves interact with each other
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Constructive- wave displacements are in the same direction
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Destructive- when two waves of opposite amplitudes meet
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Standing Wave Combination of interference Wave appears to be standing still Increasing frequency produces more nodes (points of destructive interference) and antinodes (points of destructive interference)
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