SONOGRAPHY CANADA PHYSICS CORE EXAM .

SONOGRAPHY CANADA PHYSICS CORE EXAM . what is media/medium - ANSWER biological tissue what do all waves carry from one location to another - ANSWER energy sound is a ____________ wave in which particles in the medium move - ANSWER mechanical where can sound not travel - ANSWER in a vacuum are sound waves transverse or longitudinal waves - ANSWER longitudinal the effects of the medium upon the sound wave - ANSWER acoustic propagation properties what are used to distinguish between sound waves and other types of waves - ANSWER acoustic variables- pressure, density, and distance (measure of a particle motion) what are the 3 acoustic variables - ANSWER pressure, density and distance concentration of force in an area - ANSWER pressure what is pressure measured in - ANSWER pascals (Pa) concentration of mass in a volume - ANSWER density what is volume measured in - ANSWER kg/cm^3 (cubic) what describes a sound waves features - ANSWER acoustic parameters what are the 7 acoustic parameters - ANSWER period, frequency, amplitude, power, intensity, wavelength, propagation speed how do particles move in soundwaves - ANSWER longitudinally- particles move in the same direction that the wave propagates (parallel) in-phase wave - ANSWER when their peaks and troughs occur at the same time out of phase wave - ANSWER peaks and troughs occur at difference times -either inverted or out of step what occurs when waves lose their individual characteristics and combine to form a single wave - ANSWER interference SONOGRAPHY CANADA PHYSICS CORE EXAM what combination of waves results in the formation of a single wave of greater amplitude of either components - ANSWER constructive interference what kind of wave causes the formation of a single wave of lesser amplitude causing what types of interference - ANSWER out of phase destructive interference what occures when 2 out of phase waves of equal amplitude interfere - ANSWER complete destructive interference what types of waves (phase) occur with complete destructive interference - ANSWER out of phase waves what causes waves to be momentarily in phase and out of phase (causing constructive and destructive interference) - ANSWER waves of difference frequencies what type of waves of difference frequencies result in (type of interference) - ANSWER constructive and destructive what direction of the graph is verticle vs horozontal - ANSWER y=vertical x=horozonatal what is a reciprocal - ANSWER when the 2 numbers are multiplied together to = 1 (10 x 1/10) tracy gets made king huge dense dummy cause millions (of) micro nuisances pileup - ANSWER tera (10^12) giga (10^9) mega (10^6) kilo (10^3) hecto (10^2) deca (10^1) deci (-1) centi (-2) milli (-3) micro (-6) nano (-9) pico (-12) hertz to mega hertz - ANSWER 1 000 000 1 what do parameters describe - ANSWER the features of a sound wave. 7 parameters are required to ompletely characterize a sound wave which 2 parameters are reciprocals - ANSWER period and frequency which parameters describe a waves bigness - ANSWER amplitude, power, intensity which parameter is determined by the sound source and the medium - ANSWER wavelength which parameters are determined by the sound source - ANSWER period, frequency, amplitude, power, and intensity which parameter is determined by the medium - ANSWER speed what is the time it takes a wave to vibrate a single cycle or the time from the start of one cycle to the start of the next cycle - ANSWER period what units is the period reported in - ANSWER time; microseconds, seconds what are the typical values of period in diagnostic US - ANSWER 0.06-0.5microseconds 0..0000005 (ms) what is period determined by - ANSWER sound source only can the sonographer adjust period - ANSWER no what is the number of particular events that occur in a specific duration of time - ANSWER frequency in US, what event is counted in frequency - ANSWER number of cycles .