Waves, Chapter 20 (PS 8 & 9)
Name ___________________________________________
Section 20-1
Vocabulary
Wave
Medium
Mechanical Wave
(type)
Explanation
A disturbance that transmits ________________(not
matter!) through ___________________ and/or
___________________.
To make the wave travel further, it has to have more
____________________. (Think of yelling!)
Drawing/Example
Examples:
A __________________________ the wave travels
through, such as ___________________,
________________________, or ________________.
The matter ______________ move with the wave, just
the _________________!
Require a ______________________
Examples:
Electromagnetic
Wave (type)
Do not require a _____________________
Examples:
Transverse
Compression /
Longitudinal
Waves in which particles vibrate with an
______________________________ and the particles
move ____________________________ to the
direction the wave is traveling.
Require a medium? _______
Examples:
Waves in which particles of the
__________________vibrate
_______________________________
along the path the wave travels. (and repeat pattern)
Require a medium?________
Examples:
Crest
The_____________________ point of a
___________________________ wave
Trough
The _____________________ point of a
___________________________ wave
Compression
The area where the ____________________ of the
wave ________________________ for a
_____________________________(longitudinal) wave
Rarefaction
The area of where the _________________ of the
wave ________________________ for a
_____________________________(longitudinal) wave
Section 20-1 Review
A wave is a ___________________ that carries ___________________. A wave can travel through
___________________ or _______________________. There are two kinds of waves we’ve discussed:
waves that require a medium called___________________________ or waves that do not require a
medium called ______________________________. The _____________________ waves have crests
and troughs and are the _______________________ waves. The _______________________ waves
have compressions and rarefactions are the _________________________ waves.
Section 20-2
Vocabulary
Wave
Velocity/Speed (v)
Frequency
(f)
Hertz (Hz)
Wavelength
(λ)
Unit: meters
Amplitude
Explanation
Measured in _____________.
Velocity depends on the _______________________
for a compression wave.
Drawing/Example
V= λx f
The number of ___________________ produced in a
given amount of ___________________ (how many
_________________ pass each __________________)
Count the number of ____________or _____________
for a transverse wave or the number of
_______________ or __________________ for a
compression/longitudinal wave that pass by each
second.
The higher the frequency, the ____________________
the wavelength and the ( less / more ) energy.
The unit used to measure _______________________:
1 Hz = 1 _____________/_____________________
The __________________ between two adjacent
___________ or_____________ for a transverse wave
or the distance between two adjacent
____________________ or ____________________
for a compression/longitudinal wave
λ and f have ________________
relationship
The ___________________________ distance a wave
vibrates from the ______________________________.
(The “height” of the wave)
The larger the amplitude, the ( less / more ) energy.
Section 20-2 Review
There are four properties of waves: wave velocity measured by _________________, frequency measured in
___________________, wavelength measured in _______________________ and amplitude measured in
_____________________. The speed of a wave is determined by the ___________________________ the wave is
traveling through. If wavelength increases, frequency _______________________________.
Section 20-3
Vocabulary
Explanation
Reflection
The ___________________________ of a wave after it
hits a ______________ or an object
Drawing/Example
Example:
Refraction
The ___________________ of a wave as it passes at an
_______________from one __________________ to
another due to the difference in
___________________ in the mediums.
Example:
Diffraction
Interference
Constructive
Interference
Destructive
Interference
The ________________________ of waves around a
___________________ or through an
_____________________ and is determined by the
__________________________ and/or the size of the
_______________________. (= new waves produced)
The result of two or move waves
________________________ (as a result of
diffraction). 3 Types:
When one wave ___________________ another wave.
This results in (smaller/larger) amplitudes, which
means _______ energy or __________ sounds.
When one wave __________________ another wave.
This results in (smaller/larger) amplitudes, which
means _______ energy or __________ sounds.
Example:
Example:
Example:
Example:
Two waves with identical amplitudes will
_____________________________.
Resonance
What occurs when an object vibrating at or near the
_____________________________________ of a
second object causes the second object to
_______________________________.
(They vibrate at maximum amplitude at certain
frequencies.)
Example:
Section 20-3 Review
There are four wave interactions: ______________________________, ________________________________,
___________________________________ and ________________________________. Seeing myself in the mirror is
an example of ______________________ and seeing light come into a dark room from a hallway is an example of
_________________________________. When waves overlap and become louder, we call it
_____________________________ interference. When one object vibration causes another object to vibrate, we call
that _____________________________________.