Ultrasound Physics Chp. 1

1. Give the units of measure for each term:

-Wavelength: mm, cm

-Frequency:1/sec, Hz

-Intensity: watts, sq cm

-Propagation speed: m/sec

-Period: sec, usec

-Power: watts

2. Which determines each of these parameters, the medium or the US system?

-Wavelength: both
-Frequency: sound source
-Intensity: sound source
-Propagation Speed: medium
-Period: sound source
-Power: sound source

3. Which of the following can not be changed by the Sonographer?

-Wavelength, Propagation speed, Period

4. Acoustic Variables are:

-Density, Temperature, Pressure and Particle motion

5. How many cycles occur in 0.5 seconds if the frequency is 5 million Hz? 2, 500, 000 cycles

6. What is the acoustic velocity in soft tissue? 1,540 m/s or 1.54 km/sec