Problem $3$:$$ A traveling wave along the x$-$axis is given by the following wave function

$($x$,$ t$)=4\mathrm{.}4$ cos$(1\mathrm{.}9$x $-9\mathrm{.}2$t $+0\mathrm{.}36),$

where x in meter, t in seconds, and in meters. Read off the appropriate quantities for this wave function and find the following characteristics of this plane wave:

Part $($a$)$ The amplitude in meters.

Part $($b$)$ The frequency, in hertz.

Part $($c$)$ The wavelength in meters.

Part $($d$)$ The wave speed, in meters per second.

Part $($e$)$ The phase constant in radians.