ARDMS SPI - ARDMS Sonography Principles and Instrumentation Acoustic Waves and Properties Questions and Answers

Question 1

An ultrasound wave travels through two different media. If the propagation speed in the second medium is lower than in the first, what happens to the wavelength of the sound wave?

Accepted Answer

It decreases.

Answer

It increases.

Answer

It remains the same.

Answer

It becomes zero.

Question 2

A sonographer observes that the intensity of the ultrasound beam has decreased by 3 dB. This corresponds to what change in intensity?

Accepted Answer

A twofold decrease

Answer

A tenfold decrease

Answer

A twofold increase

Answer

A threefold decrease

Question 3

Which of the following properties of a medium has the most significant influence on the propagation speed of an acoustic wave?

Accepted Answer

Stiffness

Answer

Density

Answer

Temperature

Answer

Viscosity

Question 4

Acoustic impedance is calculated by multiplying which two properties of a medium?

Accepted Answer

Density and Propagation Speed

Answer

Frequency and Wavelength

Answer

Amplitude and Power

Answer

Stiffness and Elasticity

Question 5

While scanning a patient's liver, you switch from a 3 MHz transducer to a 6 MHz transducer. Which of the following is the most likely consequence of this change?

Accepted Answer

Increased attenuation of the ultrasound beam

Answer

Increased penetration depth

Answer

Decreased image resolution

Answer

Decreased propagation speed

Question 6

The average propagation speed of sound in soft tissue, which is assumed by ultrasound systems for depth calculations, is:

Accepted Answer

1540 m/s

Answer

330 m/s

Answer

1450 m/s

Answer

4080 m/s