Physics CHP 6 & 7

Question 1

attenuation of the sound beam effects

Answer 1

amplitude, power, and intensity

Question 2

Smooth boundary, organized reflection in one direction are characteristics of ______ reflection.

Answer 2

specular

Question 3

normal incidence means the incident sound beam hits a boundary at _____ degrees.

Answer 3

90

Question 4

Orthogonal angle means that the angle of the incident soundwave is.

Answer 4

90

Question 5

Intensity of the portion of the instant sound beam that after striking a boundary returns back to where it came came from.

Answer 5

reflected intensity

Question 6

if two media on either side of the boundary, have the same impendances and the sound beam strikes at a normal angle.

Answer 6

full transmission will occur

Question 7

If the intensity transmission coefficient is 95% estimate the intensity reflection coefficient.

Answer 7

0.05

Question 8

The value of the intensity transmission coefficient ranges from.

Answer 8

0% to 100%

Question 9

The following equations to find the ITC.

Answer 9

itc %= (transmitted intensity/incident intensity) X 100 itc % = (reflected intensity/ incident intensity) X 100

Question 10

In a sunroom strikes a boundary at 48° the angle of reflection will be.

Answer 10

48 degrees

Question 11

The following conditions are needed for refraction to occur.

Answer 11

oblique incidence and different propagation speeds

Question 12

Refraction will occur perpendicular incidents when the propagation speeds of the two medium are different.

Answer 12

false

Question 13

The maximum death of you is 5 cm. The sonographer changes the imaging depth to 10 cm. How does pulse reputation period change.

Answer 13

It doubles

Question 14

A wave’s intensity is 3 mW/cm2. There is a change of +6 dB. What is the final intensity?

Answer 14

12 mW/cm²

Question 15

As the frequency doubles, the amount of Raleigh scattering:

Answer 15

increases

Question 16

A reduction in the intensity of a sound beam to 1⁄2 its original value is _________dB.

Answer 16

• 3 dB

Question 17

Snell’s Law describes the physics of ____________.

Answer 17

refraction

Question 18

Which of the following terms best describes a reflection arising from a rough boundary?

Answer 18

non-specular

Question 19

A sound wave with an intensity of 25 W/cm2 strikes a boundary and is totally reflected. What is the reflected intensity?

Answer 19

25 W/cm²

Question 20

The attenuation for soft tissue is

Answer 20

increased with increasing depth