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When the ultrasound beam strikes the surface at or nearly at right angles, the fraction of sound energy that is reflected (R) at the interface between two materials of acoustic impedance Z1 and Z2, respectively,
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When the ultrasound beam strikes the surface at or nearly at right angles, the fraction of sound energy that is reflected (R) at the interface between two materials of acoustic impedance Z1 and Z2, respectively, is given by:​

User Jesy
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17 votes
17 votes

Step-by-step explanation:

the expression of x= -4t+2t^2 where x is displecement?

User Binus
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