The Rate of Oscillation
Frequency ($f$) is the number of occurrences of a repeating event per unit of time. In wave physics, it represents the number of cycles (peaks) that pass a fixed point in one second. The unit of frequency is the Hertz (Hz), where $1 , \text{Hz} = 1 , \text{cycle per second}$.
Frequency and Energy
In many areas of physics, frequency is directly linked to energy:
- Sound: Higher frequency corresponds to a higher musical pitch.
- Light: Higher frequency corresponds to higher energy photons (X-rays have higher frequency and energy than visible light).
- Electronics: High-frequency signals can carry more data but have more difficulty passing through physical obstacles like walls.
The Formula
Where:
f=
Frequency (Hertz, Hz)v=
Wave Speed (m/s)=
Wavelength (meters, m)Example Calculation
An ocean wave has a wavelength of $20 , \text{meters}$ and is traveling toward the shore at $5 , \text{m/s}$.
- Divide Speed by Wavelength: $5 / 20 = 0.25 , \text{Hz}$.
One wave peak hits the shore every $4 , \text{seconds}$.