The frequency (f), wavelength (λ) and speed (v) of a sound wave are related as

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  1. f=vλ
  2. λ=vf
  3. \(f = \frac{\lambda}{v}\)
  4. v=λf

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Option 4 : v=λf
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CONCEPT:

  • Wave: It can be defined as the transport of energy without the transport of matter.
  • The properties of waves are:
    • Wavelength (λ): The distance between two crests or troughs of a wave is known as wavelength. One wavelength equals the distance between two consecutive crests.
    • Frequency (f): The number of oscillations or the number of waves passes a given point in one sec. Its SI unit is Hertz.
    • Time period (T): The time taken by the wave to complete one cycle.
  • The relation between velocity, wavelength, and frequency of a wave is

F2 J.K 19.5.20 Pallavi D3

⇒ v = λ × f 

That is, speed = wavelength × frequency

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