- #1

murdrobe

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## Homework Statement

The following table gives some specific acoustic impedances

Tissue or Medium Specific acoustic impedance

Air 0.00044 x 10^6

Fat 1.38 x 10^6

Water 1.5 x 10^6

Brain 1.58 x 10^6

Blood 1.59 x 10^6

Muscle 1.6 x 10^6

Bone 6 x 10^6

this was in a table, when pasted it squashes it together, not sure how to get around that sorry.

Calculate the intensity reflection coefficient, a, for the boundary between blood and muscle

## Homework Equations

R = Ir/Io = (Z2 – Z1)2 / (Z2 + Z1)2

R = reflection coefficient

Ir = Reflection intensity

Io = incident intensity

Z1 = acoustic impedance 1

Z2 = acoustic impedance 2

## The Attempt at a Solution

Z2 – Z1 = 1.6 x 10^6 – 1.59 x 10^6 = 10,000

Z2 + Z1 = 1.6 x 10^6 + 1.59 x 10^6 = 3,190,000

10,0002 = 1x10^8

3,190,0002 = 1.01761 x 10^13

1x108 / 1.01761 x 10^13 = 9.826947455 x 10^20

R = 9.83 x 10^20

id just like someone to look over this for me please and make sure I am doing this correctly as i really don't understand it and we haven't been taught very well. we were kinda given the equation and told to go away leaving me with no confidence at all. i wasnt sure whether you do the largest number - the smallest or the direction of the transition like blood/bone would be blood into bone or what...

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