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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