physics unit 5(waves)
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34 Terms
what are the 2 diffrent types of waves
Longitudinal and transverse
describe a transverse waves
Vibrations are parallel to the direction of travel
describe a transverse wave
Vibrations are at 90 degrees to the direction of travel
what is wavelength
The length of one complete wave
what is amplitude
The maximum displacment, size of one tough of a wave
what is frequency and what is it measured in
The number f waves shown in 1 second and it’s measured in hz
what is the equation for speed
Speed=distnace/time
what is the equation for wavespeed
Wavespeed=wavelengthxfrequency
what happens in reaction
A change in speed when a wave travels through an object which causes a change in direction
in a high optical density object/deep water waves are
At a slow speed
With a shorter wavelength
at a low optical denisty/deep water waves are
At a higher speed
With a longer wavelength
in reflection what happens to wave length
It stays the same
what type of waves are on te electromagnetic spectrum
Tranverse
in a vacum all waves travel at
The same speed(3×10×8
radio waves have a ___ wavelength
Long
gamma rays have ____ wavelength
Short
frequency between radio waves and gamma rays gose from
Low to high
Energy starts at___ with radio waves and gose too what with gamma rays
low to high
what are the uses of radio waves
Radio and TV
what are the uses of microwaves
Satelite
TV
Mobile phones
Cooking
what are the uses of ingrared
Optical fibers
Rmote controls
Heat treatment
what are the uses of visible light
Only part the naked eye can see
what are the uses of ultraviolet
Fraud detection
what are the uses of x-rays
Looking at broken bones
what are the uses of gamma rays
Kills cancer
what dose ionising mean and what 3 waves are ionising
causes cancer
ultraviolet
x-ray
gamm rays
what damages our retina
Visible light
what are the of microwaves
Heating water molecules in cells
what are the dangers of infrared
Heat/burns
what are the dangers of radio waves
Low danger
what are the 2 types of sataletis
Geosynchronous
Geostationary
describe a seozynchronus satellite
Orbits earth returning to the same point once every 24 hours
describe a Geostationary satellite
Stays above the same point at all times
can you send messeges between satellites
no a messeges must travel from one satellite back to a base station, before going to the next satellite