## ashley89 2 years ago To determine a waves' frequency, you must know the

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1. bhusal

velocity of wave and wavelength velocity=wavelength*frequency i.e V=L*f f=V/L

2. mr.singh

its time period

3. Shane_B

For reference:$\large f = freq, v = velocity, \lambda = wavelength, p = period, T = time$ The wave equation is defined as:$\large v=\frac{\lambda}{p}$Knowing that period is defined as:$\large p=\frac{1}{f}$You can rewrite the wave equation as as:$\large v=\lambda f$Rearrange that to see that:$\large f=\frac{v}{\lambda}$So you need to know the wavelength and the velocity to determine a wave's frequency.