Question

Can any of you help me with this problem I have been stuck on it for a while :\
A sound wave is modeled with the equation y=1/4 cos 2pi/3 theta
a.find the period
b find the amplitude

Answer 1

\[y=Acos(wt+\phi)\]
Amplitud=A

Period:
\[T=\frac{ 2 \Pi }{ w }\], \[w=\frac{ 2 \Pi }{ 3 }\]

Answer 2

is this it? I kinda dont understand...Amplitude is just A?

Answer 3

It is the number what is multiplying the cosine