Define frequency,amplitude,and speed of a sound wave.

(N/A) Frequency: It is defined as the number of oscillations or cycles completed by a wave per unit time. Its $SI$ unit is Hertz $(Hz)$.
Amplitude: It is the magnitude of the maximum displacement or disturbance of the particles of the medium from their mean position. It is denoted by $A$.
Speed: It is defined as the distance traveled by a point on a wave (such as a compression or a rarefaction) per unit time. It is calculated as $v = f \times \lambda$,where $f$ is frequency and $\lambda$ is wavelength.