Question

1. what is the frequency of a wave that has a wavelength of 20 cm and a speed of 10 m/s? (1 point)

50 hz
200 hz
0.5 hz
10 hz

Explanation:

Step1: Convert wavelength to SI unit

Convert 20 cm to meters. Since 1 m = 100 cm, then $\lambda=20\ cm = 0.2\ m$.

Step2: Use wave - speed formula

The wave - speed formula is $v = f\lambda$, where $v$ is the speed of the wave, $f$ is the frequency, and $\lambda$ is the wavelength. We need to solve for $f$, so $f=\frac{v}{\lambda}$.

Step3: Substitute values

Substitute $v = 10\ m/s$ and $\lambda=0.2\ m$ into the formula: $f=\frac{10}{0.2}=50\ Hz$.

Answer:

A. 50 Hz