Sonographic Physics Chapter 9

What vibrates to create a pulse sound that propagates into the body?

• echo

• PZT

• Backing layer

• Acoustic insulator

True or False

Every molecule of the PZT vibrates and produces little wavelets of sound

• True

• False

The wavelets combine to create the

• Energy wave

• Pulse wave

• Ultrasound beam

• Electrical beam

The beam is created by all the wavelets combining

• Constructive and Destructive

• Continuous and Pulsed waves

• Small and Large waves

• High and low waves

With the beam having constructive and destructive interference this gives the beam what kind of shape?

• Circle

• Hourglass

• Straight line

• Hollow tube

True or False

Huygen was the physicist who studied and developed theories about wave interaction.

• True

• False

Huygen's principle explains how the beam get it's

• Strength

• Shape

• Frequency

• Intensity

True or False

There are five terms that describes the shape and regions of a sound beam

1. 1. Focus

2. 2. Near zone

3. 3. Focal Length or near zone length

4. 4. far zone

5. 5. Focus zone

• True

• False

Answer explanation

5. 5. Focal Zone

What is A?

• Near zone

• Focal zone

• Far zone

• Focus

What is B?

• Near zone

• Focal zone

• Far zone

• Focus