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· REFLECTION ­ The wave is bounced back
when it hits a boundary
· REFRACTION ­ The wave changes direction as
it enters a different substance, due to parts of
the wave speeding up/slowing down.
· INTENSITY ­ The rate of flow of energy per
unit area. Measured in Wm-2. Intensity is
proportional to amplitude squared. IA2
· This is because intensity is proportional to
energy and the energy depends on the square
of the amplitude.…read more

Slide 3

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· Frequency is the inverse of the period. f=1/T
· The wave equation: v=f
· Speed = frequency * wavelength
· Imagine how long it takes for the crest of a
wave to move across a distance of one
wavelength.…read more

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· TRANSVERSE ­ All EM waves. The particles
oscillate at right angles to the direction of
travel, creating peaks and troughs
· LONGITUDINAL ­ Sound waves, the
vibrations/oscillations move in the same
direction as the wave is travelling, creating
compressions and rarefractions…read more

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· A polarised wave only oscillates in one
· A polarising filter blocks out all directions of
oscillations except for the ones in the chosen
· Only transverse waves can be polarised
· If you have two polarising filters at right
angles to each other no light gets through…read more

Slide 6

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· Light becomes partially polarised when it is
· If you view the reflected ray through a
polarising filter, the intensity of the light
leaving it will change with the orientation
· This is used to remove reflections in photos
and in sunglasses to remove glare, by blocking
out the reflected light
· Rotating the plane of polarisation affects the
· A=A0cos A0=Amplitude of original wave
· I=I cos2 I =Intensity of original wave…read more

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