Waves Flashcards
Transverse waves definition and example
Travel at 90* to the oscillation that caused them
Eg: Mexican, light
Longitudinal waves definition and example
Travel parallel to the oscillation that caused them
Eg: sound
Radio wave uses
Communication
Broadcast
RADAR
Radio wave danger
Probably none
Microwave uses
Satellite communication
Cooking
Infrared uses
Radiant heaters
Grills
Remote controls
Thermal imaging
Microwave dangers
Internal heating of body tissues
Infrared dangers
Burning of tissues
Visible light uses
Seeing
Optical fibres
Photography
Frequency time period equation
Frequency = 1/ time period
Visible light dangers
Bright light can damage eyes
Ultraviolet use
Fluorescent tubes
Tanning
Security marking
Ultraviolet dangers
Blindness
Surface cell damage
X-ray use
Imaging internal structures of the body and other objects
X-ray danger
Cancer
Gamma rays danger
Cell mutation
Cancer
Gamma rays use
Bacteria in food
Sterilise medical equipment
Treat tumours
Wave speed equation
Wave speed = wavelength x frequency
Wave front definition
Plane joining points on a wave which are at the same point in their cycle
Human frequency range
20- 20,000 Hz
amplitude definition
distance between the equilibrium line (0 displacement) and the maximum of a wave (typically the peak)
peak definition
maximum positive displacement
trough
maximum negative displacement
wavelength definition
The distance between two like points on a wave
