The speed of sound in air at 20 ∘c is 344 m/s

Unless indicated otherwise, assume the speed of sound in air to be v = 344 m/s. A sound wave in air at 20∘C has a frequency of 320 Hz and a displacement amplitude of 5.00×10−3mm. For this sound wave calculate the

a) pressure amplitude (in Pa);
b) intensity (in W/m2W/m2);
c) sound intensity level (in decibels).