Sebuah gelombang memiliki persamaan \(y = 8 \sin \pi (6t - 2x)\) dimana x dalam m dan y dalam cm.
\begin{equation*}
\begin{split}
y & = 8 \sin \pi (6t - 2x) \\\\
y & = 8 \sin (6 \pi t - 2 \pi x) = A \sin (\omega t - k x)
\end{split}
\end{equation*}
(A) amplitudo
\(A = 8 \text{ cm}\)
(B) frekuensi dan periode
\begin{equation*}
\begin{split}
\omega & = 2 \pi \:.\: f \\\\
6 \pi & = 2 \pi \:.\: f \\\\
f & =3 \: \dotso \text{ Hz}
\end{split}
\end{equation*}
\begin{equation*}
\begin{split}
T & = \frac 1f \\\\
T & = \frac 13 \: \dotso \text{ s}
\end{split}
\end{equation*}
(C) panjang gelombang
\begin{equation*}
\begin{split}
k & = \frac {2 \pi}{\lambda} \\\\
2 \pi & = \frac {2 \pi}{\lambda} \\\\
\lambda & = 1 \: \dotso \text{ m}
\end{split}
\end{equation*}
(D) cepat rambat gelombang
\begin{equation*}
\begin{split}
v & = \lambda \:.\: f \\\\
v & = 1 \:.\: 3 \\\\
v & = 3 \: \dotso \text{ m/s}
\end{split}
\end{equation*}