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I am giving a few parameters to explain my question:

If I consider two waves A and B in a medium under same conditions of density and pressure, and

If I suppose that:

Wave A has a velocity of 100 ms/s and has a frequency 5000 Hz.

Then does the wave B also have a velocity of 100 m/s? In that case could I use 100 ms/s to calculate the frequency of the wave B?

I would be helped if you could explain this.

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By the Newton-Laplace equation for velocity of sound waves which is:

$c=\sqrt\frac{B}{\rho}$
where
B: Modulus of elasticity of medium
$\rho$: Density of medium


Since we're keeping the density and pressure same, hence the velocity of the sound wave indeed would be constant. Also as we know the general formula for velocity of waves,
$v=f\lambda$ (where f is the frequency and $\lambda$ is the wavelength)
would also be constant

Hence in this situation, for any two waves A and B,
$f_{A}\lambda_{A} = f_{B}\lambda_{B}$

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