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what is the intensity (in W/m^2) of a harmonic longitudinal wave with a pressure amplitude of 7x10^-3 N/m^2 propagating down a tube filled with helium (p=0.179 kg/m^3, v=972 m/s)? A. 0.6X10^-9 B. 2.2X10^-8 C. 2.6X10^-8 D. 1.4X10^-7 E. 1.0X10^-7
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