- #1

hidemi

- 208

- 36

- Homework Statement
- The speed of sound in air in 340 m/s, and the density of air is 1.2 kg/m^3. if the displacement amplitude of a 440 Hz sound wave is 10μm. what is the intensity of the wave?

Ans: 32 W/m^2

- Relevant Equations
- I = 1/2 ρvR²w²

I = 1/2 ρvR²w²

I = 1/2 *1.2kg/m³*340m/s*(10 x 10^-6m)²*(2

I = 0.16 W/m²

This is my answer which does not match the given answer. Am I doing wrong?

I = 1/2 *1.2kg/m³*340m/s*(10 x 10^-6m)²*(2

*π**440/s)²I = 0.16 W/m²

This is my answer which does not match the given answer. Am I doing wrong?