Waves Flashcards
what is the difference between longitudinal and transverse waves?
TRANSVERSE: vibrations are perpendicular to the direction energy is transferred by the wave
LONGITUDINAL: vibrations are parallel to the direction of energy transfer
amplitude
height of wave from rest to crest
wavelength
distance from peak to peak
frequency
how many complete waves pass a certain point per second
time period
time taken (s) for one complete wave to pass a point
frequency equation
f = 1/t
wave speed equation
wave speed = frequency x wavelength
all waves transfer energy and information without….
transferring matter
define the Doppler effect
the apparent change in the frequency of a wave caused by relative motion between the source of the wave and the observer
what speed do electromagnetic waves travel at in a vacuum
the SAME SPEED, 3x10^8
what are radio waves used for
- communication (long wave and short wave)
what are microwaves used for
- satellite communication
2. heating food (conduction and convection)
what are IR waves used for
- heating/cooking food
- security (night vision equipment)
what are visible light waves used for
- optical fibres
2. photography
what are UVwaves used for
- fluorescent lamps
