Variation of Frequency of sound underwater

[NPB777]

Hello,

I am very much interested to how frequency of sound varies in water. Also, how the frequency varies with temperature and depth? What are the different formulas related to this? Secondly, how can we determine the best frequency of operation? I would be very thankful if anyone could answer the above questions or point to materials explaining the above.

With regards

 

[nasu]

It doesn't. The frequency depends on the source that produces the sound.
Maybe you mean the speed of sound. This indeed depends on temperature of the medium.