Graduates answer all questions. Undergraduate can skip one question. (1) Ultraso
ID: 2075843 • Letter: G
Question
Graduates answer all questions. Undergraduate can skip one question. (1) Ultrasound waves are used to image thyroids. If the acoustic impedance Z of a is 0.00043 times 10^-6 kg/m^2.s and 90% of the waves are reflected from thyroids the find the value of Z for Thyroids. (2) Find the reflection coefficient when ultrasound inters from kidney into liver of Patient. The densities of these tissues and the speed of sound in these tissues is given in table in the class lecture. Those data can help determining the impedance. (3) An ultrasound signal consists of a range of frequencies given in the figure below write down its central frequency bandwidth and determine the Q-factor of this signal. (4) An electrocardiogram is given below. Calculate how long (time) is the Atrial depolarization ventricular depolarization and ventricular repolarization. Give your answer in milliseconds.Explanation / Answer
Answer:
You didn't provide the data table for Question No.2. so, I can answer only Q.3 and Q.4.
(3) Central frequency f0 = (1 MHz + 9 MHz ) /2 = 5 MHz
Bandwidth of the given signal is BW = (9 MHz - 1 MHz) = 8 MHz
i.e., Bandwidth means difference between upper limit frequency and lower limit frequency.
(4) P wave represents Atrial depolarization
QRS complez - Ventricular depolarization
T wave - Ventricular repolarization
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