What are ways that waves differ?

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PS Ch. 10/11 Review

DHS PS CH 10/11 Test Review (online)

Question	Answer
What type of waves does matter in the medium move back and forth at right angles to the direction the wave travels?	tranverse
A material through which a wave transfers energy is called a?	medium
An example of a wave is?	earthquake
Sound would not travel through this type of medium?	vacuum
What type of waves are sound waves?	compressional
A repeating disturbance that transfers energy through matter or open space is a?	wave
What do waves carry?	energy
In what type of waves does matter in the medium move back and forth and in the same direction the wave travels?	compressional
What type of wave can travel through outer space?	light
A combination of compressional and transverse waves are called?	seismic waves
What is a measure of the energy in a wave?	amplitude
What are the highest points of a transverse wave called?	crests
_________ is how many wavelengths pass a fixed point each second?	frequency
The lowest points of a transverse wave are called?	troughs
What is the less dense region of a compressional wave called?	rarefaction
Transverse waves do not have?	rarefactions
As a frequency increases, wavelength _____?	decreases
a repeating disturbance or movement that transfers energy throughmatter or space is called a?	wave
Molecules pass energy on to?	neighboring molecules
All waves are produced by something that?	vibrates
A material through which a wave travels is called a?	medium
A medium may be what type of matter?	solid, liquid, or a gas
What type of waves do not need a medium to travel through?	light waves
What type of waves can travel only through matter?	mechanical waves
What type of waves does the matter in the medium move back and forth at right angles to the direction that the wave travels?	transverse waves
What is an example of a transverse wave?	water waves
What type of waves does the matter in the medium move in the same direction that the wave travels?	compressional waves
An example of a compressional wave is?	sound waves
What are ways that waves differ?	how much energy they carry how fast they travel *how they look
What type of waves have crests and troughs?	transverse waves
The highest point in a wave is called?	crests
The lowest points in a wave is called?	troughs
What type of waves have compressions and rarefactions?	Compressional waves
The dense regions in waves are called?	compressions
The less dense regions in waves are called?	rarefactions
The distance between one point in the wave and the nearest point just like it is called?	wavelength
How many wavelengths pass a fixed point each second is called?	frequency
Frequency is expressed in?	hertz (Hz)
As frequency increases wavelength?	decreases
The frequency of a wave equals the rate of?	vibration of the souce that creates it
How fast a wave moves forward is called?	wave velocity
wave speed equals?	wavelength x frequency
Light waves travel _____ than sound waves?	faster
Sound waves travel faster in this than in a gas?	liquids and solids
Light waves travel faster in _____ than empty space than in liquids and solids?	gases
A measure of the energy in a wave is called?	amplitude
The more energy a wave carries, its amplitude will be?	greater
Amplitude of compressional waves is related to how?	tightly the medium is pushed together at the compression
The denser the compressions, the ______ the amplitude is and the more energy the wave carries	larger
The less dense the rarefactions, the ______ the amplitude and the more energy the wave carries.	larger
In a thunderstorm, why do you see the lightning before you hear the thunder?	Light waves travel much faster than sound waves
When does reflection happen?	when a wave strikes an object and bounces off of it
What types of waves can be reflected?	all waves
The angle of incidence of a wave is always equal to the angle of?	reflection
An imaginary line perpendicular to reflective surface is called?	normal
The angle formed by the wave striking the surface and the normal is called?	angle of incidence
The angle formed by the reflected wave and the normal is called?	Angle of reflection
The bending of a wave caused by a change in its speed as it moves from one medium to another is called a?	refraction
The greater the change in speed is, the wave bends?	more
When a wave passes into a material that slows it down, the wave is bent how?	toward the normal
When a wave passes into a material that speeds it up, the wave is bent how?	away from the normal
An object that causes a wave to change direction and bend around it is called a?	diffraction
If the obstacle is smaller than the wavelength, the wave diffracts?	around it
If the obstacle is much larger than the wavelength, the wave diffracts?	not at all, it reflects
The larger the obstacle is compared to the wavelength, the waves will diffract?	less
The ability of two or more waves to combine and form a new wave is called?	interference
Waves pass right through each other and continue in?	their original direction
New, or composite, waves exist only while the two original waves continue to?	overlap
This is when waves add together?	constructive interference
This is when waves subtract from each other?	destructive interference
What type of wave is a wave pattern that stays in one place?	standing waves
What type of waves from when waves of equal wavelength and amplitude that are traveling in opposite directions continuously interfere with each other?	standing waves
The places where two waves always cancel each other is called?	nodes
What is the ability of an object to vibrate by absorbing energy at its natural frequency?	resonance
T/F: AM radio waves have longer wavelengths than FM radio waves making their reception much better around tall buildings and mountains	True
T/F: Refraction occurs when an object causes a wave to change direction and bend around it.	False
Reflection occurs when a wave?	strikes an object and bounces off of it
If you stand next to a swimming pool and see an object under water, it will seem to be?	closer to the surface than it really is
What is an imaginary line perpendicular to the surface of a medium where a wave strikes it?	normal
What happens when waves bend around a barrier?	diffraction
What is the process in which two waves overlap and form a new wave?	interference
When a wave pattern forms when waves of equal wavelength and amplitude, but traveling in opposite directions, continuously interfere with each other it is a?	standing wave
The ability of an object to vibrate by absorbing energy at its natural frequency is called?	resonance
Sounds are produces by?	vibrations
What type of waves are sound waves?	compressional
Two types of regions that make up compressional waves are?	compressions and rarefactions
The matter through which all sound waves travel is called?	a medium
Sound waves cannot travel in?	empty space
Sound will travel fastest in what type of medium?	solids
How does temperature of a medium affect the speed of sound waves?	as the temperature of a substance increases, sound waves in it move faster
In the human ear, sound waves are gathered in the?	outer ear
What is the spiral-shaped structure filled with liquid in the human ear?	cochlea
Sound will travel the slowest in what type of meduim?	air
What is the amount of energy that flows through a certain area in a specific amount of time called?	intensity
The human perception of sound intensity is called?	loudness
The intensity of sound is measure din units called?	decibels
The human perception of sound frequency is called?	pitch
Waves that have sound frequencies above 20,000 Hz are called?	ultrasonic
The change in pitch due to a moving wave source is called?	the Doppler effect
As an ambulance races toward you and then past you, what would the pitch of its siren do?	higher then lower
If you are lying on a raft, and you notice that the number of waves that go past the raft increases, you also find that the distance between each crest?	decreases
What type of waves are seismic waves	both transverse and compressional
If the intensity of a sound decreases, what else decreases?	loudness
When you squeeze together the coils of a spring and then release the, you a creating what type of wave?	compressional
A tuning fork starts to vibrate when a certian note is played on the piano. This is an example of?	resonance
The intensity of a sound describes?	it's loudness at a particular distance
Frequency is best explained as?	the number of wavelengths that pass a point per second
The way your brain interprets the intensity of a sound is called?	loudness
Sound travels in what type of wave?	compressional
Resonance refers to an effect in which the ?	vibration of one object causes another object to vibrate at natural frequencies
How does temperature of a medium affect the speed of sound waves?	as the temperature of a substance increases, sound waves in it move faster
A wave will travel only as long as it has what to carry it?	energy
For the Doppler effect to occur what must happen?	either source or listener must be moving
For a given wave, if the frequency doubles, the wavelength?	is halved
The energy a wave carries is measured by it's?	amplitude
When the crest of one wave passes through the trough of another wave, what takes place?	destructive interference
The pitch of a sound is most closely related to the?	frequency of vibrations
The less-dense region of a sound wave is a?	rarefaction
Because water waves have both horizontal and vertical motion, the are considered to be what type of waves?	transverse and compressional
An example of a transverse wave is?	an ocean wave approaching the shore
When a sound wave strikes your eardrum, it causes forced vibrations that are transferred to the?	hammer, anvil, and stirrup
You are creating a wave on a spring. If you start shaking the spring more slowly, the wavelength of the resulting wave will?	increase
The speed of sound in this medium is greater than the speed of sound in water?	steel
The unit used to measure frequency is called?	hertz

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