## Trigonometry (11th Edition) Clone

$P = \frac{3}{r}~cos[\frac{2\pi~r}{4.9}- (1026)~(10)]$ We can see a sketch of the graph in the window $[0,20]$ by $[-2, 2]$ The sound pressure $P$ decreases as the radius $r$ from the source increases.
$P = \frac{a}{r}~cos(\frac{2\pi r}{\lambda}- ct)$ $\lambda = 4.9~ft$ $c = 1026~ft/s$ $a = 3~lb/ft^2$ $t = 10~s$ $P = \frac{3}{r}~cos[\frac{2\pi~r}{4.9}- (1026)~(10)]$ We can see a sketch of the graph in the window $[0,20]$ by $[-2, 2]$ The sound pressure $P$ decreases as the radius $r$ from the source increases.