Summative test 2 Flashcards
is a disturbance that travels
from the source to another place
through a medium.
A wave
the object or
substance through
which the wave
travels.
Medium
Sources of waves are
Vibrating objects
This type of wave:
* Require a medium through which to travel
- It can be solids, liquids, and gas.
- Energy is transferred through vibration of
particles of the medium.
Mechanical wave
This type of wave:
Do not need a medium to travel
- Can travel through a vacuum (empty space)
Electromagnetic waves
Ths type of wave:
The particles of the medium move up
and down PERPENDICULAR to the
direction of motion of the wave.
Transverse waves
This type of wave:
The particles of the medium move in a
direction back and forth PARALLEL to the
direction of motion of the wave.
Longitudinal waves
A wave, therefore, can be defined
as a
Disturbance
the highest point of the wave
Crest
the lowest point of the wave
Trough
the midpoint of a wave
Equilibrium Position
the height of the wave, measured from midpoint to
either crest or trough; describes the amount of energy
the wave carries
Amplitude (A)
distance between succeeding identical parts (one crest
to the next crest or from one trough to the next trough)
Wavelength
the number of waves that pass in one second
The greater the __________ of a wave, the higher the
energy is carried by it.
Frequency
the time it takes
to complete one
wave
Period
speed of the wave as it travels
Wave speed
What type of wave is sound
Mechanical
HOW HUMANS PRODUCE SOUND
1.Airflow
2.Vocal chord vibration
3.Sound Wave generation
4. Resonance and Articulation
Range that humans can hear sound;
Upper limit may change if ears get damaged
Audible Sound:20 Hz to 20,000 Hz
below 20 Hz
- how elephants and
whales communicate with
each other for protection,
attracting mates, and
finding food
Infrasonic Sound
- above 20,000 Hz
- dolphins and bats send
ultrasonic waves and they can
detect if there are any obstacles
based on the time it takes for the
wave to come back
(echolocation)
Ultrasonic sound
Refers to the highness or lowness of a sound
Pitch
Intensity of a sound
Loudness
unit of intensity level for sound
Decibel
Tone quality
Timbre
In the 1600s, light is believed to have a stream
of particles (called
Corpuscles
Newton believed that light behaves like a
Particle
However, Christian
Huygens proposed that
light behaves like a
Wave
proves that light is a wave because when it
passes through a narrow opening,
Dissfraction
came up with a theory
known as the dual nature of light. He concluded
that sometimes light behaves like a particle and
has a wave-like properties in certain situations.
Max Planck
What type of wave is light:
Electromagnetic
produce their own light
Luminous Objects
allow light to pass through them
completely without scattering
Transparent Objects:
only allow partial or little
amount of light to pass through
Translucent Objects:
do not allow light to pass
through; forms a shadow
Opaque Objects:
Light travels fastest in
Gas
Sound travels fastest in
Solid
Intensity (brightness) =
amplitude
The brighter the light,
the ___________ it
has with darkness.
more contrast
varies as light
carries different
amounts of energy
- gives light its
different colors
Wavelength
Inversely
proportional to
wavelength
Frequency
