Finding Wavelength from Diagram

Finding wavelength from diagram

Transverse Wave

Wavelength is the distance between two successive crest or trough.

Longitudinal Wave

Wavelength is the distance between two successive compression or rarefaction.

Wave front diagram

Wavelength is the distance between two successive wave front

Example 1:

Figure above shows the propagation of a water wave. What is the amplitude of the wave?

Answer:
$$\text{Amplitude}=\frac{10cm}{2}=5cm$$

Example 2 :

The figure above shows a transverse wave. The wavelength of the wave is equal to
Answer:
$$\text{Amplitude}=\frac{2}{3}\times x=\frac{2}{3}x$$

Example 3:

The figure above shows the simulation of longitudinal wave by using a slinky spring. What is the wavelength of the wave?
Answer:
$$\begin{array}{l}3\lambda =15cm\\ \lambda =\frac{15}{3}=5cm\end{array}$$

Example 4:

The figure above shows the simulation of transverse wave by using a slinky spring. What is the wavelength of the wave?
Answer:
$$\begin{array}{l}2\lambda =25cm\\ \lambda =\frac{25}{2}=12.5cm\end{array}$$