Question

As the temperature of seawater increases from 15o C to 20o C, sound velocity through the seawater
a. remains the same.
b. decreases.
c. depends on the distance of the observer from the sound source.
d. increases.

Answer 1

Answer is: d. increases.
The velocity of sound in seawater changes with water pressure, depth, temperature and salinity.
Velocity can be calculeted using Del Grosso's equation, the UNESCO equation (International Standard algorithm) or Mackenzie equation.
To measure velocity navy use Expendable Bathy Thermograph.