KNS380/541 Exam 1

Ultrasound constitutes sound at frequencies above what threshold?

• less than 20 Hz

• greater than 20 kHz

• greater than 2 MHz

• greater than 200 MHz

Who helped us learn about echolocation by studying bats?

• Sergei Sokolov

• Reginald Fessenden

• Jacques & Pierre Curie

• Lazzaro Spallanzani

Who discovered the piezoelectric effect?

• Lazzaro Spallanzani

• Jacques & Pierre Curie

• Karl Dussik

• Mario & Luigi

Sonographers are at a high risk of muscuoskeletal pain and burnout.

• true

• false

The most common type of transducer for musculoskeletal ultrasound is a linear array.

• true

• false

Even though sound waves are a form of mechanical energy,

they do not need to adhere to Newton's Laws of Motion.

• true

• false

Sound waves transfer mass, energy, and momentum as they propagate through a medium.

• true

• false

Waves that propagate in a direction that is parallel to the direction of the medium's displacement.

• longitudinal waves

• transverse waves

Which term describes the areas of low pressure in a longitudinal wave?

• line of origin

• compression

• amplitude

• rarefaction

Sound waves that travel through air and water are:

• longitudinal

• transverse