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On Earth where the typical density of air is $\rho_E = 1.23\text{ kg/m}^3$, the speed of sound at room temperature is $343\text{ m/s}$.

On Mars the density of air is $\rho_M = 0.0155\text{ kg/m}^3$ and the speed of sound on a typical day is only about $240\text{ m/s}$.

If the same sound wave (same frequency and displacement amplitude) is produced on Earth and on Mars, the pressure amplitude of the wave on Mars will be what percent of that on Earth?

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