a) Given p = vZ
p = 0.01 pascals , Z = 400rayls
v = p/Z
= 0.01/400
= 0.25 * 10^-4 m/s
b) Given V = 2(pi)fA
To find amplitude A, A = v/(2(pi)f
= (0.24 *10^-4)/ (2(pi)(1000))
= 3.98 * 10^-9 N/m^2
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