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Unit 5 - Waves/Sound
DHS PS Unit 5 Waves and Sound
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 |
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 |
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 |