Chapter 3- Waves: Transverse And Longitudinal Waves Flashcards
Define a transverse wave.
Displacement of particles is at right angles to the direction of energy of propagation.
Give 4 examples of a transverse wave.
Electromagnetic waves.
Ripples on water.
Waves on the strings.
S waves (Earthquake shockwave).
What is a longitudinal wave?
The displacement of the particles is parallel to the direction of energy propagation.
Give three examples of a longitudinal wave.
Sound waves. P waves (earthquake shock waves). Waves along spring. (Springs have compressions and rarefractions).
What is a polarised wave?
A wave that oscillates in one direction only.
What is a polarising filter?
Used to polarised light and other waves.
Transmits vibrations in one direction.
How do we use two polarising filters to block out all of the light?
Put the transmission axis’ perpendicular to each other.
What is glare reduction and how does it work?
The light reflected off some surfaces are partially polarised. Using a polarising filter will block some of the reflected light.
To reduce the intensity of light entering your eye.
How does the alignment of aerials affect TV and radio signals?
To receive a strong signal, you have to line up the rods on the transmitting aerial. If the rods aren’t aligned, the signal strength will be lower, so rods on TV aerials are all horizontal.
