sir damon i need u help physics

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The equation y=As in(wt-kx)represents a
plane wave traveling along the x-direction. If
a=0.10m, w=8500hz and k=25/secs......Calculate
the speed of the Waves
-Calculate the speed of the medium through
which the wave is travelingl -What is the equation of the reflected wave
produced when thisv wave strikes a rigid
boundary normally?

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