Parameters of Sound Practice Quiz

Which of the following will increase the wavelength?

• increase in frequency

• decrease in period

• decrease in frequency

• none of the above

What is the time that defines one complete cycle to occur?

• Pulse Duration

• Amplitude

• Wavelength
• Frequency

T/F: Operating frequency is determined by the medium.

• True

• False

Answer explanation

Operating frequency is determined by the ultrasound machine only (sound source) meaning it cannot be determined by the medium or sonographer but simply the sound source (frequency)

T/F: When changing the depth, it will affect pulse duration.

• True

• False

Answer explanation

Pulse Duration = number of cycles x period. It has no relation to the depth. In other words, changing the depth (penetration) has nothing to do with the Pulse Duration.

Which of the following occurs in rarefaction?

• Pressure goes up

• pressure goes down

• density goes down

• both pressure and density go down

If frequency is increased, what would you expect to see with pulse duration?

• Pulse duration would decrease

• pulse duration would increase

• frequency would decrease

T/F: For image quality, shorter pulse durations are preferred.

• True

• False

Which parameter in ultrasound imaging determines the spatial resolution of the image?

• velocity
• wavelength
• frequency
• amplitude

Which expression among the following is not an acoustic variable?

• pressure

• density

• distance

• speed of sound

Which listed below is an acoustic variable?

• amplitude

• density

• power

• frequency