part 5 Flashcards
what is a longitude wave?
It’s a sound wave/shock wave, they are mechanical waves.
The vibration/oscillations are in the same direction of energy (straight)
They have compressions and refractions of particles
what is a transverse wave?
A light wave (all electromagnetic waves)
Water waves
The vibrations/oscillations are perpendicular 90degrees
They have peaks and troughs
what are the properties of longitude waves?
They should have compressions, refractions and be in the centre, they should also be the same distance from top to bottom.
what are the properties of transverse waves?
They should be the same height above and below the line and the gap between each peak and trough should be the same distance apart.
what are the properties of the electromagnetic spectrum?
Roy.G.Biv are the colours (Red, Orange, Yellow, Green, Blue, Indigo and Violet)
But if you reverse it to Vib G Yor you get the electromagnetic spectrum (Gamma Rays, X-rays, Ultra violet,Visible, Infra-red, Microwaves, Radiation) There are uses for each one some include: Gamma rays = sterilise, kills cancer. Infra-red = remote control.
What are the properties of the electromagnetic waves?
They all travel at the speed of light, They have a longer wavelength, lower energy and a lower frequency.
What is reflection?
Reflection, has an angle of incidence and an angle of reflection. The angle of reflection must be the same as the angle of incidence. Sound and light waves reflect off of a surface.
what is refraction?
the angle of incidence is greater than the angle of refraction when it’s moving from a low density to a high density. The sound waves and light waves change speed when they pass across the boundary between two substances with different density’s. This causes them to change direction. This is refraction.
what is diffraction?
When waves meet a gap in a barrier they carry on through the gap. However as it goes through the gap the waves spread out (to an extent) in the area beyond the gap. This is diffraction.
What’s the wave equation?
Wave speed (v or m/s) = Frequency (f or Hz) * wavelength (weird upside down y or m)
What’s the use of the wave equation?
The wave equation is there to help us describe the waves in more detail. By figuring out extra information about them.
what are the uses of electromagnetic waves in communication?
Radio waves, Microwaves, Visible light and ultra violet can all be used for communication. Radio waves are used to transmit TV and radio programmes. Microwaves transmit phone calls. We can see each other in visible light and infra-red can transmit signals from your remote to your TV as well as being in burglar alarms.
what is a ray diagram?
A ray diagram is where you draw a diagram to explain reflection in a plain flat mirror.
What is a sound wave?
A sound wave is a longitude wave that has to travel through a medium.
What are the properties of sound waves?
Echoes are reflections of sounds. The vibrations occur in the same direction as the direction of travel. Sound waves can travel through a solid, liquid or a gas.
