Determine the Intensity (In W/m²) of a Harmonic Longitudinal Wave

question 42

Multiple Choice

Determine the intensity (in W/m²) of a harmonic longitudinal wave with a pressure amplitude of 8.0 × 10−³ N/m² propagating down a tube filled with helium. (ρ = 0.179 kg/m³, v = 972 m/s.)

• A) 3.7 × 10−⁷
• B) 1.8 × 10−⁷
• C) 9.2 × 10−⁸
• D) 4.6 × 10−⁸
• E) 1.5 × 10−⁹

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