What term describes the number of cycles that an acoustic variable completes in a second?

The angle between the direction of propagation and the boundary between two media is 90 degree. What term describes the form of incidence of the wave?

Which of the following techniques is external focusing?

The scale associated with decibel notation is____________.

Acoustic impedance is a property of the _________ and has units of _________.

Traditional reference models for digital organization, such as the “OSI model”, the “TCP/IP model” and the “ANSI-ISA95 model”, usually build up from:

The lateral resolution of an ultrasound system is primarily determined by the __________.

The area that starts at the beam’s smallest diameter and extends deeper is:

What is the range of frequencies emitted by transducers used in ultrasonic imaging?

As an ultrasound wave travels through the body, its amplitude usually: