GCSE Physics (AQA)

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Frequency-Period Relation

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Waves Waves in air, fluids and solids

Frequency-Period Relation

3:41 Properties of Waves
Spec 4.6.1.2
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  • Wave patterns can be described using frequency or period.
  • Diagram of a transverse wave shows matter displacement as the pattern moves.
  • Frequency is how often peaks pass a line in one second.
  • Example: Two peaks per second indicate a frequency of two.
  • Period is the time it takes for a full cycle of the wave to pass a line.
  • Example: Half a second for a peak indicates the period.
  • Frequency and period are mathematically related: period = 1/frequency.
  • If frequency decreases, period increases.
  • Algebraic equation: T = 1/F, where T is period and F is frequency.
  • Period measured in seconds, frequency in hertz.
  • Hertz equals 1/seconds.
  • A wave with 1 hertz frequency has a period of 1 second.
  • Practice question: Calculate period of a sound wave with 2 kilohertz frequency.
  • Convert kilohertz to hertz: 2 kilohertz = 2000 hertz.
  • Use equation: period = 1/2000 = 0.0005 seconds.
  • Importance of unit conversions for exams.
  • Be comfortable converting between period and frequency and understanding their relationship.

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