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6. mechanical waves are ...

  • .. waves that progress through space with no need for a substance
  • .. waves that need a medium to travel through
  • .. waves such as x rays and light

7. transverse waves =

  • waves in which the direction of vibration is perpendicular to the direction in which the wave travels
  • has compression and rarefaction movements
  • cant be polarised

8. longitudinal waves =

  • direction of vibration is perpendicular
  • waves in which the direction of vibrations of particles are parallel to the direction in which the wave travels
  • can be polarised

9. diffraction

  • when waves spread out after passing through a gap
  • the narrower the gap the less waves spread out
  • when waves "turn" around corners

10. phase difference is ...

  • the fraction of a cycle of a wavelength
  • the fraction of a cycle between the vibration of two particles
  • distance from O in terms of wavelength

11. superposition

  • when waves combine at the moment when they pass through eachother
  • the total displacement = the sum of a single displacements
  • waves pass through eachother and disturb eachother

12. polarised waves =

  • a wave thats filtered to only let vibrations in a certain direction move
  • longitudinal waves
  • waves that travel through a filter and get stopped

13. displacement

  • number of cycles of vibration of a particle per second
  • a distance and direction from a particles equilibruim
  • height of a transverse wave