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Ch 2 Physics

DMSI112

QuestionAnswer
What is a wave? Something that carries energy from one place to another.
Waves that repeat their pattern are _______ so sound is a _____ transfer of energy. Cyclical
What are the two types of waves and which requires a medium? Mechanical and electromagnetic. Mechanical waves require a medium.
What is the definition of sound? Sound is a mechanical energy that propagates through a medium.
T or F: Sounds is a variation of pressure. True
What forces the molecules that make up the medium to undergo separate phases of increased and decreased pressure? The mechanical energy inherent to a sound wave.
What is compression? A region of increased or high molecular density.
What is rarefaction? a region of decreased or low molecular density?
What are longitudinal waves? Waves in which particle motion is in the same direction as the sound wave energy.
What are transverse waves? Waves in which particle motion is perpendicular to the direction of a sound wave energy.
Which type of wave do we use in ultrasound? longitudinal waves
T or F: Sound does not always require a medium and it can travel through a vacuum False Sound ALWAYS requires a medium it CANNOT travel through vacuum.
What are acoustic variables? Molecular agitation of the medium, as the sound beam is transmitted from one point to another. The agitation is classified in four separate factors, acoustic variables.
What are the 4 acoustic variables? Pressure- concentration of force. Density- concentration of mass/weight. Temperature- concentration of heat energy. Particle of motion- distance of particle motion.
Pressure ____ during compression of the wave and _____during rarefaction. increases, decreases
Density ( is/ is not) proportional to mass. is
Volume is ____ related to density. Inversely
What is the formula for density? mass/volume
A sound wave will go through cycles of what? Higher and lower concentrations.
As the wave travels does the density of a medium change as the cycle of the waves change? Yes, as a wave travels the density of the medium will change with the changes of the cycles of the waves.
When will particles of the medium oscillate back and forth and what does this provide? As a wave propagates through a medium, particles of the medium will oscillate back and forth. It provides movement of the energy through the medium without actually moving of the particles away from their original location.
What is the smallest portion of the medium which sound is traveling? A particle
What is a frequency? The number of cycles an acoustic variable goes through in one second. The number of time compression and or rarefaction occur per second.
One cycle per second is called a ____? Hertz HZ=1/sec
Is frequency determined by the medium or the sound source? What else is determined by this? Frequency and period is determined by the sound source.
the time it takes for one complete cycle to occur is? The period
How is period measured? In units of time
Period and frequency are_____ Reciprocal or inversely proportional.
What is the speed at which sound wave energy travels through a medium? Propagation speed
What is the symbol for propagation speed. C
The propagation speed (is/is not) always determined by the medium. The propagation speed is ALWAYS determined by the medium. But THE MEDIUM HAS ITS OWN PROPAGATIONS SPEED. (It is the property or characteristic of the medium)
T/F: every individual material has its own propagation speed. True
Why does is not matter what frequency sound wave is applied to a tissue. Since the propagation speed is a characteristic of the medium it does not matter what frequency sound wave is applied as long as it is the same tissue two waves with two different frequencies will travel at the same speed through the medium.
What is the propagation speed for soft tissue? 1.54 mm/usec
Wavelength and period are ____. Wavelength and frequency are ______ _______. proportional. inversely proportional
What is wavelength determined by? source and medium
Created by: Lindseybeck1023
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