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Question

Derive the relation between the velocity of wave, wavelength and frequency.

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Solution

Frequency wavelength and wave velocity are related as follows:
Wave length is the distance travelled by the wave during the time a particle of the medium completes one vibration.
Therefore, if λ be the wavelength and T the time period then the wave travels a distance λ and time T
Hence,
Wave velocity =DistanceTime
v=λT
v=νλ [1T=frequency(ν)]
Wave velocity= Frequency × Wavelength

The wave velocity in a medium remains constant under the same physical condition.

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