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4.4 - Wave Characteristics
- 4.4.1
- Wave pulse- a single, instant crest?
- Continous wave- A wave of
constant amplitude and
frequency; the wave goes up and
down forever (unless damped!)
- Wave pulse- a single, instant crest?
- 4.4.3
- Transverse wave- A
wave in which the
direction of disturbance is
perpendicular to the
direction of travel
- Example: Wave in a string
- Example: Wave in a string
- Longitudinal wave- A
wave in which the direction
of disturbance is parallel to
the direction of travel
- Example: Wave in a spring
- Example: Wave in a spring
- Transverse wave- A
wave in which the
direction of disturbance is
perpendicular to the
direction of travel
- 4.4.2
- Progressive waves
transfer energy.
- Progressive waves
transfer energy.
- 4.4.4
- Wavefront-
a line joining
all point in a
wave that
are in phase
- Ray- lines
drawn to show
the direction of
the wave,
perpendicular to
the wavefront
- Wavefront-
a line joining
all point in a
wave that
are in phase
- 4.4.5
- Crest-
maximum
positive
displacement
from equilibrium
position. Top of
the wave
- Trough-
maximum
negative
displacment from
equilibrium
position. Bottom
of the wave
- Compression-
pushing
together of a
longitudinal
wave,
increased
frequency,
decreased
wavelength
- Rarefaction-
spreading out of
the longitudinal
wave, decreasing
frequency,
increased
wavelength
- Crest-
maximum
positive
displacement
from equilibrium
position. Top of
the wave
- 4.4.6
- Wavelength-
distance between
two consecutive
points of a wave
that are in phase
- Wave speed-
distance travelled
by the wave profile
per unit time
- Intensity-
Power
transferred by a
wave per unit
area
- Wavelength-
distance between
two consecutive
points of a wave
that are in phase
- 44.8
- If frequency is f, the time taken for a wave to pass one cycle is 1/f.
- Velocity = distance over time
- The distance moved in one cycle is one wavelength
- So the velocity of a wave is the wavelength divided by 1/f,
which is equal to the wavelength times the frequency
- So the velocity of a wave is the wavelength divided by 1/f,
which is equal to the wavelength times the frequency
- The distance moved in one cycle is one wavelength
- Velocity = distance over time
- If frequency is f, the time taken for a wave to pass one cycle is 1/f.
- 4.4.9
- All electromagnetic waves thravel
with the same wave speed in free
space!
- All electromagnetic waves thravel
with the same wave speed in free
space!
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