
Derive the relation between the velocity of wave, wavelength and frequency.
Answer
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Hint:
Wave length is the distance travelled by the wave during the time a particle of the medium completes one vibration. Using the above definition of the wave, try to derive the relation between the velocity of wave, wavelength and frequency.
Complete answer:
We know that the Wavelength is the distance travelled by the wave during the time a particle of the medium completes one vibration.
Let be the wavelength, be the velocity and be the time period
We know that the velocity is defined as the distance travelled per time taken.
Mathematically it can be represented as
It implies since the distance travelled is and the time taken is
We know that the frequency is inversely proportional to the time period.
Mathematically it can be represented as
Put this in above relation, we obtain the final relation as
Therefore the wave velocity = frequency wavelength is the relation between the velocity of wave, wavelength and frequency.
Note:
Under the same physical conditions the wave velocity in a medium remains constant. When the wave travels from one medium to another the frequency never changes and when the wave travels into the denser medium the wavelength decreases and it slows down.
Wave length is the distance travelled by the wave during the time a particle of the medium completes one vibration. Using the above definition of the wave, try to derive the relation between the velocity of wave, wavelength and frequency.
Complete answer:
We know that the Wavelength is the distance travelled by the wave during the time a particle of the medium completes one vibration.
Let
We know that the velocity is defined as the distance travelled per time taken.
Mathematically it can be represented as
It implies
We know that the frequency is inversely proportional to the time period.
Mathematically it can be represented as
Put this in above relation, we obtain the final relation as
Therefore the wave velocity = frequency
Note:
Under the same physical conditions the wave velocity in a medium remains constant. When the wave travels from one medium to another the frequency never changes and when the wave travels into the denser medium the wavelength decreases and it slows down.
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