AAMC Dropper Effect questions and answers 2023/2024

AAMC Dropper Effect questions and answers 2023/2024 When the level of liquid inside a buret is higher than outside, what does that mean for the gas pressure inside the buret? - correct answer It is lower thab outside An ultrasound examination could show the motion of a fetus. In order to image this motion, the ultrasound examination devices requires what minimal information? A.The speeds of the sound and of the moving object. B.The speed of the sound, and the frequencies of the sound waves emitted and observed. C.The speeds of the sound and of the moving object, and the frequencies of the sound waves emitted and observed. D.The speeds of the sound and of the moving object, and the frequencies and wavelengths of the sound waves emitted and observed. - correct answer B. The Doppler effect in ultrasound waves is used to provide fetal images. The Doppler effect relates the frequency of the ultrasound wave as detected by a moving detector to the frequency of the wave when the source is stationary, the speed of the source, and the speed of the detector. Doppler effect equation - correct answer f' = f (Vw)/(Vw-Vs) where V = speed of sound in the medium Vd = speed of the detector Vs = speed of the source Top sign: toward (if source or detector is moving toward other) Bottom sign: away (if they moving away from other object) *Treat numerator and denominator separately when deciding if top or bottom sign Relationship between temperature and resistance - correct answer Directly proportional