Question

A wave has a wavelength of 13 mm and a frequency of 4 hertz. What is its speed?

Answer 1

The velocity of a wave is described by the following equation:

`v= \lambda f`

Where v is velocity, λ is the wavelength and f is the frequency. Note that the wavelength given is:
`13mm=13 * 10^(-3)m`

Thus,

`v=(13 * 10^(-3)m)(4Hz)=0.052m/s=5.2 * 10^(-2)m/s=5.2cm/s`

The velocity is 5.2 cm/second or 0.052 m/s or 52 mm/s