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Ch 9/10 Waves/Sound

DHS PS Ch 9/10 Waves/Sound 2018/2019

QuestionAnswer
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
Some examples of waves would be? water, sound, light, seismic, etc.
Sound would not travel through this type of medium? vacuum
What type of waves are sound waves? longitudinal
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 or radio 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? compressions or rarefactions
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, gas, or any combination of these
What type of waves can travel only through matter? mechanical waves
What are the two types of mechanical waves called? transverse and compressional
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? Part of a water or seismic wave, "the wave", shaking a rope, snake in the grass, etc.
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? Part of a water or seismic waves, sound waves, dominoes, slinky, spring, accordion, etc.
How can waves differ? energy, speed, and appearance
What type of waves have crests and troughs? transverse waves
The highest point in a transverse wave is called? crests
The lowest points in a transverse 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)
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
An imaginary line perpendicular to reflective surface is called? normal
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
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 is the ability of an object to vibrate by absorbing energy at its natural frequency? resonance
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
If a wine glass produces a 330 Hz tone when struck, what frequency tone would be used to break it? 330 Hz
What is the ability of an object to vibrate by absorbing energy at its natural frequency? resonance
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
The human perception of sound frequency is called? pitch
A tuning fork starts to vibrate when a certian note is played on the piano. This is an example of? resonance
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
The pitch of a sound is most closely related to the? frequency
The unit used to measure frequency is called? hertz
Ultrasound can be used to break up _____ _______ . kidney stones
Humans can hear sound frequencies between ______ and ______ . 20 Hz to 20,000 Hz
Created by: pherriman
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