Physics > EXAM > DMS-101 Exam 1 (ALL) | 224 Questions with 100% Correct Answers (All)

DMS-101 Exam 1 (ALL) | 224 Questions with 100% Correct Answers

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What is sound? - ✔✔A wave which is created by vibrating objects and propagated through a medium from one location to another Can sound travel in a vacuum? - ✔✔No What is ultrasound? - ✔�... �Sound that has a frequency beyond the limits of perception by the human ear What is the range of human hearing? - ✔✔20 Hz-20,000 Hz What is the range of infrasound? - ✔✔<20 Hz What is the range of ultrasound? - ✔✔>20,000 Hz What is echolocation? - ✔✔The use of ultrasound at various frequencies to locate and identify objects in the water and air What is diagnostic ultrasound? - ✔✔a diagnostic procedure that uses high frequency sound waves to image organs, masses, and fluid collections in the body Who discovered the piezoelectric effect? - ✔✔Pierre and Jacques Curie in 1880 Who is Paul Langevin? - ✔✔French physicist, began developing sonar devices to locate submarines in WWI- developed the hydrophone in 1915 What was Ultrasound used for in the 1930s-1940s? - ✔✔To dectect flaws in metal Who is Karl Therodore Dussik? - ✔✔first physician to employ ultrasound in medical diagnosis in 1940 What happened in 1960? - ✔✔The first commercially available ultrasound scanner was developed Name 3 types of display modes - ✔✔A-mode, B-mode, M-mode What is A-mode? - ✔✔Amplitude mode, amplitude is displayed as a vertical deflection of the baseline What is B-mode? - ✔✔Brightness mode, echo signals displayed as a dot on a screen, brightness of the dot proportional to the echo signal amplitude [Show More]

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