p2:waves Flashcards
what is a progressive wave
transfers particles from one place to another(not matter)
part
how do waves and particles move in a progressive wave
particles move up and down in a fixed position
what are two waves in phase said to be
be in coherence
what do we use to measure phase
radians or degrees
whats the equation phase difference
t(first wave)/T(2 waves) x360
how do you calculate phase shift
t/T
what is all light in the em spectrum made of and what angle do they travel at to each other
electricval and magntic field
that travel 90 degrees to each other
what does a polarisation filter do
only allows waves through that are a certain orientation
what is sunlight special (unpolarised)
waves that are orientated in all directions
what is plane polarisation
light is reflected off many surfaces(water, painted surfaces) the light becomes polarised
what the difference beween metallic and non metallic surfaces in terms of poleristion
non metallic surfaces(snowfields,water) - polarise
metallic - do not
how are EM waves transmitted(4 things)
em waves transmitted form an antenna the waves are polarised
receiving ariels need to be aligned with the waves
to do this transmitter and aligners will be 90 degrees to each other
allows signals to always be recieved
