10 — Sound, ultrasound

Question 1

Give the frequency range of sound waves audible by a normal human ear.

Answer 1

Question 2

What is ultrasound?

Answer 2

Question 3

Give the definition and unit of sound intensity.

Answer 3

Question 4

Define in words the compressibility of a medium.

Answer 4

Question 5

Define acoustic impedance of a medium and provide a formula showing how it depends on other properties of the medium.

Answer 5

Question 6

Describe the relationship between the propagation speed of sound (c) characteristic of a given medium and the acoustic impedance of the medium (Z).

Answer 6

Question 7

List the most widespread effects suitable for the generation of ultrasound.

Answer 7

Question 8

Describe the relationship between the amplitude of the ultrasound-induced pressure fluctuation (ΔPmax) and the intensity of ultrasound (J)

Answer 8

Question 9

What is cavitation?

Answer 9

Question 10

How does the intensity of ultrasound change while it passes through a certain medium?

Answer 10

Question 11

What does the reflexivity (extent of reflection on the interface of two media) of ultrasound depend on?

Answer 11

Question 12

What is the basis of imaging with ultrasound?

Answer 12