Sound Waves 2 Flashcards
Is intensity; power; amplitude directly or indirectly related?
Directly Related
What is intensity proportional to?
Power or mathematically, to the waves Amplitude².
What always follows the word ampitude?
squared
What is power related to?
Amplitude²
What is intensity related to?
Amplitude²
What happens to intensity if a waves power is doubled?
intensity is doubled
What happens to intensity if a waves power is quartered?
intensity is quartered.
What happens if a waves amplitude is doubled?
Intensity increases 4 times.
What is the symbol for wavelength?
λ
What term describes the length/distance of one complete cycle?
Wavelength
What is a wavelength determined by?
both the sound source and medium
Can wavelength be adjusted?
No
What is the propagation speed of sound in soft tissue?
1.54
What is the only parameter determined by both sound source and Medium?
Wavelength
How is wavelength and frequ3eny related?
inversely related
What is the equation for finding the wavelength of sound in a medium?
1.54 ÷ frequency
As frequency increases, wavelenght…..
decreases
Does a shorter wavelength produce higher or lower quality images?
Higher quality images.
How are wavelength and intensity related?
unrelated
_____________ is the distance a sound wave travels in 1 second.
Propogation speed
What is the unity for propagation speed?
distance ÷ time
Meters/second mm/µs
What is propagation speed determined by?
Medium only
True or False, all sound travels at the same speed regardless of frequency.
True.
Can propagation speed be adjusted?
No
What does propagation speed depend on?
Density and stiffness
What are the 3 ways you can report speed of sound in soft tissue?
1.540 m/s
1.54 mm/µs
1.54 km/s
How is propagation speed determined?
Frequency x wavelength
What does sound travel fastest in?
solids
What does sound travel slowest in?
gasses
What characteristics affect the speed of sound?
density and stiffness
What describes the ability of an object to resist compression?
stiffness
How is stiffness and speed related?
directly
What happens to the speed of sound when a medium becomes stiffer?
Speed of sound increases.
How can the degree of stiffness be described?
With the term elasticity or compressibility
Is elasticity/ compressibility the same or different as stiffness?
opposite of stiffness
How is elasticity and speed related?
inversely
How are non-stiff medium described?
compressible or elastic
What describes the weight of a material?
Density
Does non-dense material weight a lot or a little?
A Little
How are density and speed related?
Inversely
What happens to the speed of sound as a medium becomes more dense?
speed of sound decreases
True or False, Sound travels faster in medium with a higher density?
False, sound travels faster in a medium with lower density.
If 2 medium have the same stiffness, which one will have the lower speed?
The denser medium.
True or False, when density decreases, speed decreases.
False
Materials that are stiff, but not dense will have _______ speed.
fast
Materials that are not still but very dense will have a _______ speed.
slower
Which parameter is only determined by the medium?
speed
What 3 parameters are adjustable?
Amplitude, power, and intensity
What are bioeffects?
The effects of sound on tissue.
What are acoustic propagation properties?
The effects of tissue of a sound wave.
