Q) If the velocity of blood flow in the aorta is about (0.32 m/s) , what pulse frequency would you expect if a (4.3 MHz) simeq ultrasound was directed along the blood flow and the waves were reflected from the red blood cells? Assume that waves travel at a speed of (1.54*10^3 m/s)

A geological disturbance in San Andreas fault generated a seismic wave that was detected in Phoenix, AZ, approximately 1000 km from the epicenter. If such waves travel at an average speed of 6.5 km/s, what would be the time-lag between the disturbance and the detection? How does this speed compare with that of sound waves in air at a day temperature of 23°C? 2.6 min, vseismic/ Vsound 19 O 2.6 min, vseismie/ Vsound 26 O 2.9 min, vseismie/ Vsound 29 O 3.2 min, vseismic/ Vsound 21

High-intensity focused ultrasound (HIFU) is one treatment for certain types of cancer. During the procedure, a narrow beam of high-intensity ultrasound is focused on the tumor, raising its temperature to nearly 90 °C and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 3.10 MHz produced an intensity of 1425.0 W/cm². The energy was delivered in short pulses for a total time of 2.60 s over an area measuring 1.20 mm by 5.30 mm. The speed of sound in the soft tissue was 1570 m/s, and the density of that tissue was 1492.0 kg/m³. What was the wavelength of the ultrasound beam? How much energy Etotal was delivered to the tissue during the 2.60 s treatment? What was the maximum displacement A of the molecules in the tissue as the beam passed through? λ = Etotal A = = 5.06 X10-4 5.8 ×10¹2 Incorrect 3.15 x10-7 Incorrect m m

Two progressive waves yj = A sin( 4 x - ot) and y2 = A sin( 2" x – ot – 5) travel in the same direction. Calculate the velocity of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 =8.7 m and w =12.7 rad/s (radian per second). Give your answer in Sl units.

A typical guitar string has a mass per length of 0.401 * 10–3 kg>m and is tightened to atension of 71.4 N. What is the speed of waves on the string?

Use the wave equation to find the speed of a wave given byy(x, t) = (3.00 mm) sin[(4.00 m-1)x - (7.00 s-1)t].