Physics1-NatureOfWaves
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Physics1-NatureOfWaves

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    Physics1-NatureOfWaves Physics1-NatureOfWaves Presentation Transcript

    • PHYSICS 1 The Nature of Waves
    • Forth andVIBRATIONS AND WAVES Back
    • VIBRATIONS OF A PENDULUM Vibration  Wiggles in TIME  Swings forth and back  By its nature, it wiggles Galileo Galilei  Pisa Cathedral; chandelier  Isochronism of the pendulum Length and Mass  Length affects the number of swings  Mass does not affect the number of swings
    • “The crests andPARTS OF A WAVE troughs of the sea of life that flows”
    • WAVE DIAGRAM Wave Length Amplitude CrestEquilibrium Trough
    • PARTS OF A WAVE Crest  Highest point away from the equilibrium Trough  Lowest point away from the equilibrium Amplitude [ A ]  Size of the maximum disturbance away from the equilibrium  Distance from the equilibrium to the crest or trough Wavelength [ λ ]  One cycle from the equilibrium  Distance between one full crest to one full trough  Minimum distance for a wave to repeat itself  Distance between two successive, identical parts of the wave
    • PERIOD AND FREQUENCY
    • PROPAGATION OF Wave Motion WAVES
    • ENERGY TRANSFER  Mass and energy are transferred  Energy is transferred but not mass  A continuous production of pulses creates a wave
    • CHARACTERISTICS OF WAVES1. A wave transfers energy2. A wave does not transfer matter from one place to another3. A wave transmits information1.5 10.5 0 210 75 90 315 0 15 30 45 60 105 120 150 195 225 255 285 300 330 345 360 165 240 270 180 135-0.5 -1-1.5
    • T YPES OF WAVES Mechanical Wave  Waves that need a medium to travel Electromagnetic Waves  Waves that do not need a medium to travel Medium  Material used for energy to travel  Can be solid liquid or gas
    • T YPES OF WAVES Longitudinal Waves  a wave who’s direction of propagation is parallel to the direction of vibration Transverse Waves  a wave who’s direction of propagation is perpendicular to the direction of vibration A longitudinal wave can be represented as a transverse wave and vice versa
    • FrequencyWAVE SPEED and Wavelength
    • INTRODUCTION
    • WAVE EQUATION
    • In PhasePARTICLE MOVEMENT and Out of Pase
    • DEFINITIONS Wave Motion  Transfer of energy from the source to a distant receiver without the transfer of matter. Precise Definition for Wavelength  A wavelength is the distance between two successive particles vibrating in phase Phase of the Wave  The motion, direction and position of a particle within the wave sequence
    • PHASE In Phase  Particles have the same displacement and are moving in the same direction  Particles that are an integral number of wavelengths apart are vibrating in phase Out of Phase  Particles that have opposite displacement and are moving in opposite directions Particles in one wavelength have the same frequency and amplitude but there is a phase lead from one particle to the next Particles that are a half of a wavelength or a half plus an integral amount of wavelengths are exactly or totally out of phase