General properties of wave

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General properties of wave

  1. 1. CHAPTER 13 WAVES
  2. 2. WAVE <ul><li>A wave is made up of periodic motion (motion which is repeated at regular intervals). </li></ul><ul><li>The source of any wave is a vibration or oscillation. </li></ul><ul><li>Wave motion provides a mechanism for the transfer of energy from one point to another without the physical transfer. </li></ul>
  3. 3. Wave motion <ul><li>Wave motion on a rope </li></ul><ul><li>Wave motion in a ripple tank </li></ul><ul><li>Wave motion in a spring </li></ul>
  4. 4. Long Long slinky spring
  5. 5. <ul><li>Transverse waves are waves that travel at right angles to the direction of vibrations </li></ul><ul><li>Examples: water, light & radio waves. </li></ul>transverse waves
  6. 6. LONGITUDINAL WAVES <ul><li>Longitudinal waves are waves that travel in the same direction in vibrations. </li></ul><ul><li>Examples, sound waves. </li></ul>
  7. 7. <ul><li>Amplitude – it is the maximum displacement of a particle from it rest position. </li></ul><ul><li>Wavelength – it is the distance between two successive crests or troughs. </li></ul><ul><li>x and x’ are in phase (these two points move in the same direction, have the same speed and same displacement) </li></ul>Definitions of amplitude and wavelength
  8. 8. Definitions of frequency and period <ul><li>Frequency – the frequency ( f ) of a wave is the number of crests ( or troughs ) that pass a point per second. (SI Unit Hertz – Hz) </li></ul><ul><li>(Frequency is the number of complete waves/cycle formed in a second.) </li></ul><ul><li>Period ( T ) – the time taken for one complete oscillation </li></ul><ul><li>Wavelength ( λ ) – the distance between two points in a wave that are in phase. </li></ul>
  9. 9. EQUATION
  10. 10. Practice Question <ul><li>What is the wavelength of the wave motion? </li></ul><ul><li>If the period of the wave shown above is 1.0 s, what is the frequency and speed of the wave? </li></ul><ul><li>Sketch the profile of the wave after 0.025 s with point Q labeled. </li></ul>
  11. 11. that's all folks

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