By using ultrasound waves, state what the specific acoustic impedance of a medium means.
The intensity reflection coefficient $\alpha$ for two media with specific acoustic impedances $Z_1$ and $Z_2$ is given by $\alpha = \dfrac{(Z_1 - Z_2)^2}{(Z_1 + Z_2)^2}$. Calculate the fraction of the ultrasound intensity that is reflected at the muscle-bone boundary.
Calculate the fraction of the ultrasound intensity that passes through $3.4\,\text{cm}$ of muscle.
Use your answers in (i) and (ii) to determine the ratio $\dfrac{I_R}{I}$.
The intensity reflection coefficient $\alpha$ for two media with specific acoustic impedances $Z_1$ and $Z_2$ is given by $\alpha = \dfrac{(Z_1 - Z_2)^2}{(Z_1 + Z_2)^2}$. Calculate how much of the ultrasound intensity is reflected at the muscle-bone boundary.
Calculate the fraction of the ultrasound intensity that passes through a thickness of $3.4\,\text{cm}$ of muscle.
Use your answers in (i) and (ii) to determine the ratio $\dfrac{I_R}{I}$.