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The Waves Serena Silipo 4B liceo scientifico E.Majorana A.S. 2016/2017

Learn about the different types of waves, their characteristics, and how they propagate through mediums. Explore mechanical and electromagnetic waves, transverse and longitudinal waves, and key concepts such as amplitude, period, frequency, phase, wavelength, and speed.

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The Waves Serena Silipo 4B liceo scientifico E.Majorana A.S. 2016/2017

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  1. The Waves Serena Silipo 4BliceoscientificoE.MajoranaA.S. 2016/2017

  2. A wave is a disturbance that propagates through a medium.Propagation describes the spreading of a disturbance.Waves transfer energy but not mass.

  3. Mechanical WavesMatter is the medium.Sound is a mechanical wave.Electromagnetic WavesElectric and magnetic fields are the media.Light is an electromagnetic wave.Gravitational WavesThe gravitational field is the medium.The existence of gravitational waves has not yet been confirmed.

  4. Transverse WavesThe disturbance is perpendicular to the direction of propagation.All electromagnetic waves are transverse. This includes light.A crest is a point of maximal change in the positive direction.A trough is a point of maximal change in the negative direction.Longitudinal WavesThe disturbance is parallel to the direction of propagation.Sound is a longitudinal wave.

  5. Amplitude (A)The maximum absolute value of a periodically varying quantity.Amplitude has the unit of the quantity that is changing.Period (T)The time between successive cycles of a repeating sequence of events.The SI unit of period is the second [s].Frequency (ƒ)The number of cycles of a repeating sequence of events in a unit interval of time.Frequency and period are reciprocals (or inverses) of one another:ƒ = 1/T.The SI unit of frequency is the hertz(Hz).

  6. Phase (ϕ)The stage of development of a periodic process.Phase is an angular quantity.The SI unit of phase is the radian, which is itself a unitless ratio.Wavelength (λ)The distance between any point on a periodic wave and the next nearest point corresponding to the same portion of the wave.The SI unit of wavelength is the meter [m].Speed (v)Waves propagate with a finite speed that depends upon…the type of wave, the composition of the medium, andthe state of the mediumv = Δs/Δt the rate of change of distance with time by definition.v = ƒλ t.The SI unit of speed is the meter per second [m/s].

  7. An earthquake is the perceptible shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's crust that creates seismic waves.

  8. Tsunamis are long-wavelength, long-period sea waves produced by the sudden or abrupt movement of large volumes of water. In the open ocean the distance between wave crests can surpass 100 kilometers, and the wave periods can vary from five minutes to one hour. Large waves produced by an earthquake or a submarine landslide can overrun nearby coastal areas in a matter of minutes.

  9. THANKS FOR WATCHING

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