What is the speed of propagation of a wave if its length is 30 m, and the period of oscillation is 15 s?

As you know from the school physics course, the wavelength can be calculated using the following formula:

λ = v * T, where v is the speed of propagation of our wave, and T is, accordingly, the period of oscillation.

Let us determine which value will correspond to the speed of propagation of our wave, when it is precisely known from the condition of our problem that with a length of 30 meters, its oscillation period is 15 seconds:

λ = v * T;

v = λ: T;

30:15 = 2.

Answer: The propagation speed will be 2 m / s.