Frequency measures how often a periodic event occurs per unit time. For waves, it represents the number of complete cycles passing a point each second.
Discover FizziQ
How to measure it in class
With FizziQ, you can measure and analyze frequencies:
Steps:
- Use the microphone to record sounds
- View the frequency spectrum using the spectrogram
- Identify fundamental frequency and harmonics
- Compare frequencies of different musical notes
Scientific activities on this topic
Frequency experiments include:
- Measuring musical note frequencies
- Studying tuning forks
- Analyzing voice and instrument sounds
- Investigating resonance phenomena
Learn more
Frequency is fundamental to understanding:
- Sound and music (pitch is determined by frequency)
- Light and color (different frequencies = different colors)
- Radio communications (different stations use different frequencies)
- Electrical systems (50/60 Hz power frequency)
The human hearing range is approximately 20 Hz to 20,000 Hz.
Formula
Frequency is the inverse of period:
f = 1/T
Where:
- f: frequency (Hz)
- T: period (s)
Relationship with wavelength and wave speed: f = v/λ
Related concepts
Period - Wavelength - Wave speed - Hertz - Pitch - Harmonics