physics unit 1- waves

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  • we use waves to transfer energy and information
  • two types of wave : 1) tranverse- the oscillation of particles is up and down (at right angles to the direction at which it travels)  2) longitudinal- the oscillation of particles is across (parallel to direction at which it travels)
  • longitudinal waves have compressions and rarefractions
  • electromagnetic waves= light and radio waves can travel through a vacuum as there are no particles in the wave- ALL ARE TRANSVERSE
  • mechanical waves= waves on springs and sound waves can travel through a medium- CAN BE LONGITUDINAL OR TRANSVERSE
  • sound waves are longitudinal
  • ampltiude- the height of the wave crest from rest position
  • the wavelength- distance of one wave crest to the next
  • frequency- number of crests passing one point in a second
  • speed of wave= frequency (hz)  x wavelength (m)
  • frequncy of a longitudinal wave is amount of compressions passing one point in a second
  • image seen in a mirror is due to reflection of light
  • angle of insidence- angle between ray i and the normal
  • angle of refraction- angle between ray r and the normal
  • for any relflected ray ANGLE OF INSIDENCE= ANGLE OF REFRACTION
  • imagine in a plane mirror= upright, virtual, same distance behind mirror as infront
  • REAL IMAGE- can be formed on a screen…

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