Types of progressive waves (Polarised Waves (E.g. vertical weaves will get…
Types of progressive waves
Transverse wave - The displacement of the wave is perpendicular to the prorogation direction of the wave.
Some other examples of transverse waves are:
ripples in water.
waves on strings.
ALL EM WAVES ARE TRANSVERSE.
Improving TV and radio signals
TV signals are polarised by the orientation of the rods on top of houses. To receive a strong signal, you will have to line up the receiving rods with the rods emitting the signal.
It's the same with a radio as well. If you try and tune a radio by moving the aerial around your signal will come and go as the receiving rods go in and out of alignment with the transmitting rods.
All signal emitters are horizontal, so all TV rods are positioned horizontally when a house is built.
unpolarised light can hit glass block at a right angle to produce partially-polarised light (some of the light waves are vibrating in the same direction).
This partially-polarised light can then be put through a polarising filter to produce polarised light. This allows us to see underwater shapes more clearly. As partially polarised light can be produced through unpolarised light reflecting off of surfaces of water, as well.
This reduces the intensity of the light that is entering your eye. It can be used in Polaroid glasses to reduce glare.
Longitudinal wave - the displacement of the wave is parallel to the propagation direction of the wave.
Sound waves are examples of longitudinal waves. A slinky is also a good example of a longitudinal wave, alongside a P-wave (another type of earthquake).
A sound wave consists of alternate compressions and rarefractions of the medium that it's travelling through. This is why sound can't travel through a vacuum.
E.g. vertical weaves will get through the first polarising filter, however, the second polarising filter will be horizontal meaning these vertical waves won't be able to get through either.
If two polarising filters are placed perpendicular to each other, then no light will be able to get through at all.
Unpolarised waves are waves which have a displacement in all different directions.
If a filter is vertical and an unpolarised transverse wave comes at it then only vertical vibrating waves will pass through it.
A POLARISING FILTER can be used to polarise these unpolarised waves. It only transmits waves that are vibrating in a certain direction.