Specular reflection occurs when ____________

Piezoelectric crystals ___________

PRP and PRF can be changed by __________

Gel is considered to be __________

The range of PRF used in diagnostic ultrasound is _______

The Curie temperature is ___________

When attenuation is reported as an decibels per cm of path length it is called ________

As frequency decreases, period ______

The formula for Duty Factor is ______

Pulses used for diagnostic ultrasound are usually ____ cycles long.