Physics Flashcards
What type of wave is sound?
Mechanical and longitudinal wave
What can sound not travel through?
vacuum
True or false: Sound does not travel in a straight line
False
What does sound require to travel?
A medium to travel through
Can sound waves be seen?
No
What are the three variables used to distinguish between sound waves and other types of waves?
- Pressure
- Density
- distance
What is necessary of the 3 acoustic variables to be considered a sound wave?
One of the variables will have rhythmic oscillations
Another term for sound wave
Acoustic wave
Define Pressure and units
concentration of force in an area.
Pascals (Pa)
Define Density and units
Concentration of mass in a volume
kg/cm3
Define Distance and units
measure of particle motion
cm, ft, mile ect.
What are the 7 acoustic parameters used to accurately describe the characteristics of a sound wave?
- Period
- Frequency
- Amplitude
- Power
- Intensity
- Wavelength
- Propagation speed
What is a longitudinal wave?
When particles displacement is parallel to direction the wave is travelling
What is a transverse wave?
When particle motion is perpendicular to the direction of wave energy propagation
What range of sound is audible to humans?
between 20Hz-20,000Hz
What is infrasound/infrasonic?
Frequency <20Hz
What is ultrasound/ultrasonic?
Frequency >20,000Hz
What is the speed of sound through human tissue?
1540m/s or 1.54 mm/microsecond or 1.54 km/s
What is attenuation?
When the sound waves intensity, power and amplitude reduces as it travels through a medium
How is frequency and attenuation related?
Directly
What are in-phase waves?
Waves whose peaks occur at the same time
What are out-of-phase waves?
Waves whose peaks occur at different times
