Question

The sound from a trumpet radiates uniformly in all directions in air with a temperature of 20∘C. At a distance of 4.98 m from the trumpet the sound intensity level is 56.0 dB. The frequency is 586 Hz. Use 344 m/s for the speed of sound in air, 1.20 kg/m3 for the density of air, and 1.00×10⁻¹² W/m2 for the reference intensity.

a) What is the pressure amplitude at this distance?

b) What is the displacement amplitude? Use 1.42×10⁵ Pa for the adiabatic bulk modulus of air.

c) At what distance is the sound intensity level 25.0 dB?

Answer 1

Thanks you.