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Science Test tomorrow....
uhhh.... yea 8th grade science
32
Education
8th Grade
03/15/2011

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Cards

Term
What is the amplitude of a wave?
Definition
height of the wave
Term
What about a sound wave does amplitude change?
Definition
loudness
Term
What is the wavelength of a wave?
Definition
crest to crest/ trough to trough
Term
If you increase the wavelength of a wave, what else does that change about the wave?
Definition
lower frequency
Term
What characteristics of a sound wave does wavelength affect?
Definition
pitch
Term
A low point of a wave is called a _____
Definition
trough
Term
A crest is the _____ of a wave.
Definition
top
Term
When the particles of the medium move back and forth along the direction of the wave motion, the wave is a ______ ______
Definition
longitudinal wave
Term
When the particles of a medium are far apart, that part of the wave is called a ______
Definition
rarefaction
Term
Compression is the part of the medium where particles are _____
Definition
compressed
Term
A wave in which the particles of the medium move at right angles to the direction in which the wave travels is called a _____ _____
Definition
transverse wave
Term
Amplitude is the ____ __ ___ ____
Definition
height of the wave
Term
A larger amplitude means _____, smaller amplitude means ____
Definition
more energy/ less energy
Term
Frequency is the _______
Definition
number of waves produced in a certain time.
Term
How do you measure frequency?
Definition
count the number of crests or troughs in a certain time.
Term
Frequency is expressed in ____ and ____ equals _____
Definition
hertz/ 1hz/ 1 wave/s
Term
The higher the frequency, the (shorter, longer) the wavelength.
Definition
shorter
Term
Higher frequency means (more, less) energy
Definition
more
Term
What is wave speed?
Definition
speed a wave travels
Term
How do you find wave speed?
Definition
measure the distance a single crest travels in a given time.
Term
Sound travels fastest through (liquid, gas, solid). Why?
Definition
solid/ more particles to bounce off of
Term
Reflection
Definition
occurs when a wave bounces back after striking a barrier ex. mirror
Term
Refraction
Definition
Bending of a wave as it passes at an angle from one medium to another (speed changes)
Term
Diffraction (defense)
Definition
the bending of a wave around a barrier or through an opening
Term
Wave
Definition
a disturbance that transmits energy through matter or space.
Term
What do waves carry?
Definition
energy
Term
Can waves travel in a vacuum?
Definition
yes
Term
Medium
Definition
the substance through which a wave can travel. Can be a solid, liquid, or gas.
Term
Why can't you hear an alarm clock if you put it in an air tight jar?
Definition
sound waves depend on the vibration of air molecules so they must have a medium through which to travel. In a vacuum, there are no molecules to travel through.
Term
Mechanical Waves
Definition
waves the require a medium. ex. sound waves, ocean waves, seismic waves, and waves on a guitar string.
Term
If there is an explosion in space, does it make a sound? explain.
Definition
no/ sound requires a medium to travel through and there are no molecules in space. It's a vacuum.
Term
Are light waves mechanical? Explain
Definition
no/ light can travel through space so it does not require a medium.
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