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# Physics1-NatureOfWaves

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### Physics1-NatureOfWaves

1. 1. PHYSICS 1 The Nature of Waves
2. 2. Forth andVIBRATIONS AND WAVES Back
3. 3. 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
4. 4. “The crests andPARTS OF A WAVE troughs of the sea of life that flows”
5. 5. WAVE DIAGRAM Wave Length Amplitude CrestEquilibrium Trough
6. 6. 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
7. 7. PERIOD AND FREQUENCY
8. 8. PROPAGATION OF Wave Motion WAVES
9. 9. ENERGY TRANSFER  Mass and energy are transferred  Energy is transferred but not mass  A continuous production of pulses creates a wave
10. 10. 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
11. 11. 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
12. 12. 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
13. 13. FrequencyWAVE SPEED and Wavelength
14. 14. INTRODUCTION
15. 15. WAVE EQUATION
16. 16. In PhasePARTICLE MOVEMENT and Out of Pase
17. 17. 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
18. 18. 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