Question

You are scanning an interface at normal incidence in which the acoustic impedance is unchanged from one media into the other.

a) all of the sound will be reflected.
b) some of the sound will be transmitted and some of the sound will be reflected.
c) Refraction of the sound beam will occur.
d) There will be no reflected sound.
e) Most of the sound will be absorbed at the interface

Answer 1

At normal incidence, if the acoustic impedance of two media is the same, there will be no reflected sound and total transmission will occur due to impedance 'match'.

Step-by-step explanation:

When scanning an interface at normal incidence where the acoustic impedance remains unchanged from one media into the other, the correct answer is 'd) There will be no reflected sound.' This is because reflections at boundaries between different media occur due to differences in acoustic impedance, which is the product of the density of the medium and the speed of sound through that medium. When the acoustic impedances of two media are the same, the reflection coefficient is zero, indicating total transmission and no reflection. This scenario is known as an impedance 'match,' which provides an efficient coupling of sound energy from one medium to another and is essential for applications like ultrasound imaging.