A wave with a length of 4.5 meters propagates at a speed of 2.25 m / s. Find the frequency and period of the wave.

The distance between adjacent wavefronts is called the wavelength λ.
Wavelength is the distance between particles vibrating with the same phase. The wavelength is independent of coordinates and time.
c-phase velocity, or wave propagation speed, meter / second;
f is the frequency with which each particle in the wave oscillates, Hertz;
T = 1 / f-period, the duration of the full oscillation of the particle, Second;
λ-wavelength, distance between particles vibrating with the same phase, Meter;
c = λ / T;
T = λ / s = 4.5 / 2.25 = 2s.
c = λ * f;
f = s / λ = 2.25 / 4.5 = 0.5Hz