The distance travelled by a wave in a medium in one second is called the velocity of propagation of the wave in that medium. If v represents the velocity of propagation of the wave, it is given by
Velocity = Distance travelled / Time taken

*Important terms used
in wave motion*

*(i) Wavelength (**λ**)*

*The distance travelled by a wave during which
a particle of the medium completes one vibration is called wavelength*. It is also defined* *as the distance between any two nearest
particles on the wave having same phase.

Wavelength may also be
defined as the distance between two successive crests or troughs in transverse
waves, or the distance between two successive compressions or rarefactions in
longitudinal waves.

*(ii) Time period (T)*

*The time period of a wave is the time taken by
the wave to travel a distance equal to its wavelength.*

*(iii) Frequency (n)*

*This is defined as the number of waves
produced in one second. If T represents the time required by a particle to
complete one vibration,*

*then it makes1/T waves in
one second.*

Therefore frequency is
the reciprocal of the time period (i.e) *n*
= 1/T.

*Relationship between
velocity, frequency and wavelength of a wave*

The distance travelled
by a wave in a medium in one second is called the velocity of propagation of
the wave in that medium. If *v*
represents the velocity of propagation of the wave, it is given by

_{Velocity = Distance travelled / Time taken}

v
= λ/T = n λ

The
velocity of a wave (v) is given by the product of the frequency and wavelength.

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