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Published byEmery Gibbs Modified over 4 years ago

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Waves Parts, Types, and Interactions

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Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer energy from one place to another.

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Longitudinal Waves Medium travels parallel to direction of wave propagation. (sound, p-waves)

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Transverse Waves Medium travels perpendicular to direction of wave propagation. (light, s-waves)

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Types of Waves

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Water Waves (swell) Water waves are the superposition of longitudinal and transverse motions of water molecules. Individual water molecules travel in circles.

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Wave Parameters Wavelength ( ) length or size of one oscillation Amplitude (A) strength of disturbance (intensity) Frequency (f) repetition

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Wave Parameters

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Wave Properties Waves are oscillations that transport energy. The energy of a wave is proportional to its frequency. Fast oscillation = high frequency = high energy Slow oscillation = low frequency = low energy The amplitude is a measure of the wave intensity. SOUND: amplitude corresponds to loudness LIGHT: amplitude corresponds to brightness

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Wavelength Measure from any identical two successive points 510152025303540

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Wavelength Measure from any identical two successive points 510152025303540 30 - 10 = 20

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Wavelength Measure from any identical two successive points There are 4 complete oscillations depicted here ONE WAVE = 1 COMPLETE OSCILLATION 510152025303540 22.5 - 2.5 = 20

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Frequency Frequency = number of WAVES passing a stationary point per second (Hertz)

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Remember… Frequency (f) = number of oscillations passing by per second Period (T) = length of time for one oscillation T = 1/ff = 1/T

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Wave Speed Wave speed depends on wavelength and frequency: v = f Which animal can hear a shorter wavelength? Cats (70,000 Hertz) or Bats (120,000 Hertz) = v/f

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Wave Speed = v/f Higher frequency = shorter wavelength Lower frequency = longer wavelength

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Wave Interference Waves add constructively.

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Wave Interference Waves add constructively.

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Wave Interference Waves cancel destructively.

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Wave Interference Waves oscillate “out of phase”. ½ wavelength phase shift

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Wave Interference

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Waves at a Boundary Reflection: waves “bounce” off barrier.

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Waves at a Boundary Reflection: Waves will always reflect in such a way that the angle at which they approach the barrier equals the angle at which they reflect off the barrier

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Waves at a Boundary Refraction of waves involves a change in the direction of waves as they pass from one medium to another

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Waves at a Boundary Diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.

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Waves at a Boundary animations

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