Question

A wave passes from one minimum to another medium. Mention the property of the wave
which changes
which does not change.

Answer 1

We know that

$v=f\times \lambda$

where,

$\lambda$ is the wavelength

$f$ is the frequency

$v$ is the velocity

Now, velocity and wavelength changes when a wave moves from one medium to another.

But frequency remains constant as it is the characteristics of the source which produces the sound.