frequency
the frequency remains the same as sound enters in water, actually speed of sound increases 3 times when it enters in the water. Jayant Sagar
That would depend what it enters from. If the light is transitioning from air to water,its speed decreases. If it's going from jello to water, its speed increases.
Speed is that parameter which doesn't change.
Water vapor enters the air as water at the surface evaporates or as plants transpire water vapor from their leaves.
through water mostly, some enters from the air.
Slows IF it enters the water from air (and not - say - glass).
Being a wave, sound can change its direction if it goes from one medium to another - for example, from air to water.
When a ray of light travels it is in a wave and when it enters from air to water it becomes more dense and harder to move so the waves are refracted.
Water vapour
Water vapour
Water vapour
The stone will drag air down with it as it enters the water.