Question

The inverse of the frequency of a wave is

• A. wave speed
• B. wavelength
• C. time period
• D. wave energy

Answer 1

The correct option is C time period

The frequency of a wave ($\text{f}$) is defined as the number of times a particle of the wave oscillates about its mean position in one second. Whereas, the time period ($\text{T}$) is defined as the time taken for a particle to perform one oscillation about its mean position. Therefore, time period and frequency are simply the mathematical inverses of each other.
$⟹\text{f}=\frac{1}{\text{T}}$ and $\text{T}=\frac{1}{\text{f}}$ or $\text{fT}=1$