Echo sounding is used to measure the depth of the sea. It involves sending sound waves (usually low-frequency) into the water and measuring the time it takes for the sound waves to bounce off the seafloor and return. By calculating the round-trip travel time, echo sounding systems can determine water depth accurately, aiding navigation and mapping of underwater terrain.
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Echo sounding is used to measure the depth of the sea (Option [C]). It involves the transmission of sound waves, typically low-frequency, into the water. These waves travel through the water until they encounter the seafloor, where they are reflected back to the surface. By measuring the time it takes for the sound waves to make this round trip, echo sounding systems can accurately calculate the depth of the water.
This technique is crucial for maritime navigation, underwater mapping, and scientific research. It allows ships to determine safe passage routes, avoid shallow areas, and map the contours of the ocean floor. Echo sounding is based on the principle of sound wave reflection, where the depth is directly proportional to the time delay between transmission and reception of the sound waves.
Options [A] and [B] are incorrect because echo sounding does not involve generating vibrations or increasing the frequency of sound waves. Therefore, among the options provided, echo sounding is specifically used to measure the depth of the sea through the reflection of sound waves.