Figure shows the output from a pressure monitor mounted at a point along the path taken by a sound wave of a single frequency traveling at 343 m/s through air with a uniform density of 1.21 kg/m3. The vertical axis scale is set by Δps = 4.0mPa. If the displacement function of the wave is written as s(x, t) = sm cos (kx ?? wt), what are

(a) sm,

(b) k, and

(c) w? The air is then cooled so that its density is 1.35 kg/m3 and the speed of a sound wave through it is 320 m/s. The sound source again emits the sound wave at the same frequency and same pressure amplitude. What now are?

(d) sm,

(e) k, and

(f) w?

Transcribed Image Text:

Ap (mPa) Ap Ap t (ms)