The displacement of the medium in a sound wave is given by the equa...

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The displacement of the medium in a sound wave is given by the equation \( ; y_{1}=A \cos (a x+b t) \) where
P \( A, a \& b \) are positive constants. The wave is reflected by an obstacle situated \( a t x=0 \). The intensity

W. of the reflected wave is \( 0.64 \) times that of the incident wave.
write the equation for the reflected wave.
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