Question

1. what type of sonar causes loud noise in the water?

high frequency
low frequency

Explanation:

Low - frequency sonar has longer wavelengths and can travel long distances in water. When operating, it can generate relatively loud noise in the water environment. High - frequency sonar has shorter wavelengths and is more affected by water absorption and scattering, and generally does not cause as loud noise as low - frequency sonar in water.

Answer:

Low Frequency