OCR A Level Physics Exploring physics 2018 Q12
The table shows some data on two tissues in a patient.
Tissue Density Acoustic impedance
X ρ 1.5Z
Y 1.3ρ Z
Ultrasound in tissue X is incident at the boundary between the tissues X and Y.
What is the percentage of the ultrasound intensity reflected at the boundary?
A 1.7 %
B 4.0 %
C 13 %
D 20 %
The answer is B could someone please explain why
Tissue Density Acoustic impedance
X ρ 1.5Z
Y 1.3ρ Z
Ultrasound in tissue X is incident at the boundary between the tissues X and Y.
What is the percentage of the ultrasound intensity reflected at the boundary?
A 1.7 %
B 4.0 %
C 13 %
D 20 %
The answer is B could someone please explain why
(edited 4 years ago)
Thanks I just realised that I made the question ten times more complicated than it was. (1.5-1)squared / (1.5+1) squared
Thanks a lot!!!!!!
Original post by Joinedup
have you got
R=(Z1-Z2)2 / (Z1+Z2)2
in your notes?
R=(Z1-Z2)2 / (Z1+Z2)2
in your notes?
Thanks a lot!!!!!!
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