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46 Cards in this Set

  • Front
  • Back
transfer of energy from one point to another with no transfer of mass.
wave
material through which a disturbance travels
medium
particles vibrate perpendicularly to the direction of the wave motion
transverse wave
example of a transverse wave
a stadium wave
particles vibrate parallel to the direction of wave motion
longitudinal wave
example of longitudinal wave
sound waves
the highest point above the equilibrium position
crest
the lowest point below the equilibrium position
trough
distance between two adjacent similar points of a wave, such as from crest to crest or trough to trough
wavelength
variable for wavelength
lambdu
the maximum displacement from equilibrium
amplitude
the region of a more denser concentration
compression
are of lesser concentration
rarefaction
number of cycles that pass a given point in each second
frequency, f
what is frequency measured in?
hertz
the time it takes to execute a complete cycle of motion
period, T
the combination of two overlapping waves
superposition
what does FM stand for?
frequency modulation
what does AM stand for?
amplitude modulation
what is FM measured in?
megahertz 10^6 (MHz)
What is AM measured in?
kilohertz 10^3 (kHz)
same parts of two waves meet and are added together to form a larger wave
constructive interference
different parts of two waves meet and subtract to make a smaller wave
destructive interference
parts of two waves meet and completely cancel eachother out
comple destructive interference
standing wave
resultant WAVE PATTERN that not move along the string.
points where the two waves cancel
node
halfway between two nodes, largest amplitude occurs
antinode
what is a sound?
longitudinal wave
average human can hear this frequency
audible
the higher the frequency the higher the ______ of the sound.
pitch
humans can hear _________ Hz
20-20,000
frequencies less than 20 Hz
infrasonic
frequencies above 20,000 Hz
ultrasonic
sound travels this many times faster in water than in air at o degrees celcius
4.5
as the temperature increases, the speed of sound ________
increases
approx speed of sound in m/s or mph
depends on temp: 330 m/s or 700 mph
faster than sound
supersonic
what you hear when the compressed air hits your ear drum
sonic boom
sound must be about _____ apart for us to distinguish them as seperate sounds
1/10 sec
a frequency shift that is the result of relative motion between the source of waves and an observer
doppler effect
if the source is moving toward the observer the frequency ________, so use _____.
increases, subtraction
if the source is moving away from the observer the frequency ________, so use _______.
decreases, addition
measure of loudness
decibel level
every 10 dB increase is perceived as being ____as loud
twice
everything will vibrate at a particular frequency
natural frequency
condition that exists when the frequency of a force applied to a system matches the natural frequency of vibration of a system.
resonance ex:pushing someone on a swing