Question

The frequency of a source is 15KHz. The frequencies of the sound wave produced by it in water and air will:
a) be same as that of the source
b) be different. Frequency in water will be more than that of air.
c) be different. Frequency in air will be more than that of water.
d) depend upon the velocities of sound in these media

Answer 1

When sound travels from one medium to another, both its velocity and wavelength undergo changes. ... Thus, if the velocity of sound doubles when it travels from one medium to another, its wavelength also doubles. The frequency of sound depends upon the source of sound, not the medium of propagation.
So frequency will remain same.
Answer is option A.