Question

Sound waves of wave length x travel from medium in which velocity is v/m/s into another medium in which velocity is 3m/s is the wave length of sound in the second medium.

Answer 1

ya the length will be three times of its velocity

Answer 2

from the relation,v=lamda.f
v=x.f
f=v/x

now for the second medium
lamda=v/f
=3x/v
or 3*the wavelength in the first medium/velocity in the first medium