Question

A sinusoidal wave of frequency f=100 hz propagates in a medium with a speed 12m/s.Give the expressions of the distance separating:
A) two in-phase points
B) two anti-phase points

Answer 1

$$\lambda=\frac{v}{f}=\frac{12}{100}=0.12\ m$$

a)

$$x=n\lambda=(0.12n)\ m$$

b)

$$x=(n+0.5)\lambda=(0.12n+0.06)\ m$$