# physics- waves

Jun 17th, 2015
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Mechanical waves- • Requires a medium.• Generated by vibrated sources.• The energy is transferred to the medium and transmitted by the particles. • There are two types of mechanical waves: Longitudinal and Transverse Waves.

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Mechanical waves-Requires a medium.Generated by vibrated sources.The energy is transferred to the medium and transmitted by the particles.There are two types of mechanical waves: Longitudinal and Transverse Waves.LongitudinalThe direction of the wave is parallel to the vibration of the source.They have compressions and rare fractions.Experiment to observe the longitudinal wave Slinky.Examples of longitudinal waves Sound, EarthquakesTransverse Waves The direction of the wave is perpendicular to the vibration.Can be polarizedExamples Light, water wave, guitar strings.Amplitude - Is the maximum displacement from the mean position of a particle.Period is the time taken for one complete oscillation.Frequency is the number of complete oscillations per second.Phase - is the position within a cycle that a particle occupies related to the onset of the cycle.Electromagnetic wavesElectromagnetic waves are created when charged particles are accelerated.Examples Radio wavesElectromagnetic waves can also be created as a result of quantum jumps of electrons in atoms or from excited nuclei. The waves produced in this manner are emitted as photons.Photon is a discrete packet of energy. Wave equationsReflectionsThe law of reflection states that the angle between the incident ray and a normal drawn at the point of reflection is equal to the angle between the reflected ray and the normal in the plane of the ref

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