We know that speed of sound in liquid is more than in air. Also, velocity of sound = wavelength X frequency. Now theres a change in speed of sound from air to liquid, so, wavelength or frequency should have got changed... But, generally, frequency won't change for an object (correct me if I'm wrong). So there should be a change in wavelength... My question is how? The reason? (Please try to explain also at molecular level) Thanks.