SPI ARDMS Exam – Questions & All Correct Answers (Rated A+)

SPI ARDMS Exam – Questions & All Correct Answers (Rated A+) SPI ARDMS Exam – Questions & All Correct Answers (Rated A+) The time from the beginning of a pulse until its end is ______________? - ANSWER - pulsed duration What happens to the speed of sound in a medium when the bulk modulus of the medium increases? - ANSWER - faster ___________ resolution is determined by SPL - ANSWER - radial or axial If a wave's amplitude is doubled, what happens to the power? - ANSWER - quadrupled Power of sound has units of: - ANSWER - watts If the intensity of a sound beam remains unchanged while the beam area is reduced in half, what has happened to the power? - ANSWER - halved Which of these intensities is the smallest? SATP, SPTP, SATA - ANSWER - SATA The duty factor for CW ultrasound is: - ANSWER - 1.0 What is the minimum value of the duty factor? - ANSWER - 0% What are the units of intensity? - ANSWER - watts/cm2 Impedance is the _________ of _________ and _________ - ANSWER - product, propagation speed, density What are attenuation's three components? - ANSWER - scattering, reflection, absorption For soft tissue, the approximate attenuation coefficient in dB/cm is equal to one-half _________ in _________ - ANSWER - frequency, MHz As the impedance of two media become vastly different , the: - ANSWER - reflection increases The angle between two media is 90 degrees. What is this called? - ANSWER - orthogonal incidence The angle between two media is 56 degrees. This is called: - ANSWER - oblique incidence Refraction only occurs if there are: - ANSWER - oblique incidence and different propagation speeds With normal incidence, what factors affect refraction? - ANSWER - none of the above T/F: With right angle incidence, reflections are always generated at a boundary if the propagation speeds of the media are different