waves Flashcards
what is amplitude
distance from the equilibrium position to the point of maximum displacements
longitudinal waves
there oscillations are parallel to energy transfer. particles vibrate parallel to the wave direction
transverse waves
there oscillations are perpendicular to energy transfer. particles vibrating perpendicular to the wave direction
what is the wave equation
v = y x f
wavespeed = wavelength x frequency
what is time period
time it takes for one wavecycle
phase
the phase of a wave is just a point on a wave
what is the phase difference
the difference between two point on a wave in units of degrees or radions.
example of a longitudinal wave
sound waves
example of a transverse wave
EM spectrum
what is the first step of the motion of particles on a wave
the particle moves upward perpendicular to the wave direction
what are the 2 types of superstition
constructive and deconstructive
what is the second step of the motion of particles on a wave
the particles moves through the equilibrium position
what is superposition
superposition is where two or more waves combine together
what is the third step of the motion of particles on a wave
it continues upward until it reaches the crest
what happens in superposition in a constructive wave
amplitude increases
what is the last step of the motion of particles on a wave
the particle then moves downward moving back through the equilibrium position and eventually reaches the trough
what happens in superposition in deconstructive interference
amplitude decreases (extreme case = waves cancel each other out)
what is polarisation
waves are polarised if they are vibrating parallel to eachother
how can we polarise life
only the waves vibrating parallel to the slits get through
what is the time period
time it takes for one wave cycle
what is the time period equation
T = 1/f
what is the node
point of zero displacement
what do progessive waves do
move forward in space
transfer energy outwards
EM waves, sound waves
waht is the antinode
point of maximum displacement
what do stationary waves do
trapped between two points
energy is stored between the two points
musical instrument, vibration on bridges
standing waves equation
wavelength = length of string/ number 9f waves
what happens to stationary waves on a string
when a string is vibrated at certain frequencies, stationary waves can form. the different stationary waves that can form are called harmonics
how many waves are in the EM spectrum
7
what is the frequency, and what is it measured in
measured in Hz, and number of waves per second
what is the two things on a longitudinal wave
rarefraction (spaced out part)
compression (packed part)
what is pnmm bu kmg
pico, nano, micro, milli. Base unit. kilo, mega, giga
what is time period measure in
seconds
