Question

what is the speed of a wave with a frequency of 20hz. and a wavelength of .4m ?
100m/s
.8m/s
25m/s
8m/s

Explanation:

Step1: Recall wave speed formula

Wave speed $v$ is given by $v = f \times \lambda$, where $f$ is frequency and $\lambda$ is wavelength.

Step2: Substitute given values

$f = 20\ \text{Hz}$, $\lambda = 0.4\ \text{m}$, so $v = 20 \times 0.4$

Step3: Calculate the result

$v = 8\ \text{m/s}$

Answer:

D. 8m/s