100% M: Waves sound and light Flashcards
what is a pulse
a single disturbance in a medium
what is a medium
any substance through which the pulse moves
what is a transverse wave
a wave in which the medium vibrates at right angles to the direction of its propagation. Particles move up and down.
what is propagation
wave movement
what is the amplitude
Is the maximum disturbance of a particle from its rest (pulse)
what does it mean if two pulses meet each other at the same time and place
the two pulses interfere with each other
name the two types of meeting points
constructive Interference
destructive interference
what is constructive interference
when the displacements are in the same direction = the resultant displacement will increase
what is the destructive interference
when the displacements are in opposite direction = the resultant displacement will decrease
what is the principle of superposition?
the magnitude(size) of the resultant displacement is the algebraic sum of the displacements of the pulses before the interference occurred
draw an example of constructive/destructive interference
what is a wave
a regular succession of pulses
what are the two types of waves
mechanical ( needs a medium)
electromagnetic (does not need a medium)
what is an example of mechanical and electromagnetic waves
mechanical —> sound/water waves
electromagnetic—> light/ radio waves
what is a crest
the highest point on a wave
what is a trough
the lowest point on a wave
what does it mean if the points are (in phase)
. same direction
. same wavelength
. same instant
what does it mean if the points are (out of phase)
what is wavelength
the difference between two successive(one after the other) in phase points
what is period (T)
of a wave is the time taken for a single wave to pass a given point
what is frequency (f)
the number of full waves passing a given point in one second
what is wave speed
the distance traveled by a wave in one second
what is longitudinal waves
consists of a series of consecutive compressions and rarefactions which move parallel to the direction of propagation. Particles move right angles to the direction of the wave
what is compressions
areas where the coils are close together
what are rarefaction
areas the coils are spread further apart than they are when the spring is at rest.
wave speed in longitudinal waves
the speed at which the compressions and rarefactions move through the medium parallel to the direction of propagation.
amplitude in longitudinal wave
the maximum distance the particles of the medium move from the rest position.
where do the particles travel faster
solid => liquid
what is pitch and what is affected
refers to the high or low sound
frequency and wavelength
what is loudness, what is affected and what is sound measured in
loudness depends on the amplitude, amplitude, decibels (dB)
what is loudness, what is affected and what is sound measured in
loudness depends on the amplitude, amplitude, decibels (dB)
what is noise
when wave patterns are irregular and has no clear repetitive
what is ultrasound
sounds with the frequency of greater than 20Hz and cannot be heard by the human ear
what is wave-particle duality
when electromagnetic radiation can be explained by using a wave model or a particle model
what is quanta
the energy of electromagnetic radiation divided
what is a photon
carries energy directly proportional to the frequency
what is an example of electromagnetic wave
light
what is VHF
Very High Frequency
what is UHF
Ultra High Frequency
