Q2-) You are measuring blood velocity V at the aorta using doppler ultrasound. The angle 0=60°, Transmitter frequency ft=10Mhz. Sound velocity in blood, c = 1579m/s. Doppler shift fa is measured as 19kHz. а) b) the cross sectional area of the aorta for the given parameters? Find blood velocity V. Typical cardiac output from left ventricle to aorta is about 4.8L/min. What is transducer (frequency f) Doppler frequency (f d) = 2. ft. V. cos beam fd - doppler shift c-is speed of sound in tissue ft - transmited beam V- velocity of the blood 0- angle of incidence between the ultrasound beam and the direction of the flow flow velocity = V

Pr5. Two identical loudspeakers are located at points (-10,0,0) and (0,0, 10) of our coor- dinate system, where the numbers in the brac- kets correspond to the (r, y, z) coordinates of the points, expressed in meters. The loudspeakers are driven by the same oscillator with a frequ- ency of 170 Hz. The speed of sound in air can be considered 340 m/s. a) Give the coordinates of those points loca- ted on the positive r axis where the sound waves coming from the two loudspeakers interfere con- structively. b) A receiver is started to move slowly from the origin (0,0,0) along a path lying in the r-y plane so that it receives constant sound intensity throughout its slow motion. What is the shape of the path the receiver should take?

q/ A single-atom crystalline chain with an Space between 3x10 ^ -10m. If the velocity of sound is equal to 300 m / sec, calculate the cutoff frequency wm

The area of a typical eardrum is approximately 5.0 x 10°m². Calculate the sound power on the eardrum at: (Intensity = Power/Area) a. The threshold of hearing. b. The threshold of pain.

The speed of sound in air is 340 m/s, and the density of air is 1.20 kg/m³. If the displacement amplitude of a 510.0-Hz sound wave is Pa 14.0 μm, what is its pressure-variation amplitude? i