how the soundwaves are used to known the depth of area of sea
Answers
The depth of the ocean is calculated by knowing how fast sound travels in the water (approximately 1,500 meters per second). This method of seafloor mapping is called echosounding. ... Water depth is typically measured by echosounders that transmit sound at 12 kiloHertz (kHz).
Echosounders can use different frequencies of sound to find out different things about the ocean. Water depth is typically measured by echosounders that transmit sound at 12 kiloHertz (kHz). Lower frequencies (3.5 kHz) can be used to look at the layers of sediments below the seafloor. Higher frequencies can be used to identify fish and plankton that are in the water column.
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in shallow water sound waves will return very first an d deeper water are lower frequencien (3.5 Khz)to look at the layers