Waves - PHYSICS Flashcards
What differs transverse waves from longitudinal?
Transverse waves - are waves where the oscillation is perpendicular to the direction of travel.
Whereas with longitudinal the oscillation is parallel
Differences between longitudinal and transverse waves include…
-The direction of particle oscillation
-Transverse waves have peaks and troughs whereas longitudinal waves have compressions and rare fractions
-Longitudinal waves always need a medium (matter) to travel through
What are the similarities between longitudinal and transverse waves?
-Both transfer energy
-Both can be reflected
-Both have repeated cycles
What is the frequency of a wave?
The number of waves passing a point in one second. Measured in hertz.
What is the period of a wave?
How long it will take for one wave to pass a point . Inverse of frequency
Speed = ………. X ……….
Speed = frequency X wavelength
Equation for the period of a wave=
T=1/f
Average speed of sound = …………/time
Distance
Equation of frequency = number of waves / ………..
time taken
Velocity = ……….. X ……….
Velocity = frequency X wavelength
What are the seven types of waves?
-Ultraviolet
-Radio
-Visible
-X-ray
-Infarared
-Gamma
-Microwaves
What type of wave has the lowest frequency?
Radio waves
What are the dangers of radio waves?
-Cancer
-Leukaemia
What are the uses of microwaves?
-A cooking microwave
-Phones
-WIFI
What are the dangers of microwaves?
Cataracts
How is infrared produced?
It is given off by hot objects
What are the uses for Infrared?
-Remote controls
-Healing injuries (sports)
-Night cameras
What is visible light given off by?
Anything that is hot enough to glow
What are the uses of visible light?
-DVD players
-Laser printers
What are the dangers of visible light?
Damage the retina in your eye
What are the uses for Ultraviolet?
Sun tan
Detecting forged bank notes
Kill microbes
Sterilisation
What produces ultra violet light?
The sun
Special lamps
What are the damages of X-rays
Cell damage
Cancer
What is the highest frequency waves?
Gamma.
What is rarefraction?
When waves cross a boundary between different mediums causing a change in speed and direction and therefore wavelength
What are the four different surfaces on a Leslie cube?
A shiny metallic surface
A white surface
A shiny black surface
A Matt black surface
What gives off infrared radiation?
All bodies (objects), no matter the temperature emit and absorb infrared radiation.
